Revert 183580 - added a static initializer on Mac

> Merge BrowserListImpl into BrowserList.
> 
> Kept AddBrowser and RemoveBrowser static (having it access the private members of the appropriate list for the browser added/removed); kept AddObserver and RemoveObserver static so that observers are notified about browser additions, removals, and set actives on every desktop (observers should filter if they so desire).
> 
> The only calls that are not-static (i.e. for which consumers need to be aware of HostDesktopType) are: iterators, size(), empty(), get(), and GetLastActive(). All the consumers were already made multi-desktop aware in the multiple CLs preceding this one :)!
> 
> BUG=129187
> 
> 
> Review URL: https://chromiumcodereview.appspot.com/12281006

TBR=gab@chromium.org
Review URL: https://codereview.chromium.org/12310034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@183701 0039d316-1c4b-4281-b951-d872f2087c98

34 files changed, 403 insertions, 300 deletions

diff --git a/chrome/browser/app_controller_mac_browsertest.mm b/chrome/browser/app_controller_mac_browsertest.mm
index 62d2680..aec0f00 100644
--- a/chrome/browser/app_controller_mac_browsertest.mm
+++ b/chrome/browser/app_controller_mac_browsertest.mm
@@ -10,6 +10,7 @@
 #import "chrome/browser/app_controller_mac.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #import "chrome/common/chrome_switches.h"
@@ -22,7 +23,7 @@ namespace {
 class AppControllerPlatformAppBrowserTest : public InProcessBrowserTest {
  protected:
   AppControllerPlatformAppBrowserTest()
-      : native_browser_list(BrowserList::GetInstance(
+      : native_browser_list(chrome::BrowserListImpl::GetInstance(
                                 chrome::HOST_DESKTOP_TYPE_NATIVE)) {
   }
 
@@ -32,7 +33,7 @@ class AppControllerPlatformAppBrowserTest : public InProcessBrowserTest {
   }
 
   // Mac only has the native desktop.
-  const BrowserList* native_browser_list;
+  const chrome::BrowserListImpl* native_browser_list;
 };
 
 // Test that if only a platform app window is open and no browser windows are
@@ -52,7 +53,7 @@ IN_PROC_BROWSER_TEST_F(AppControllerPlatformAppBrowserTest,
 class AppControllerWebAppBrowserTest : public InProcessBrowserTest {
  protected:
   AppControllerWebAppBrowserTest()
-      : native_browser_list(BrowserList::GetInstance(
+      : native_browser_list(chrome::BrowserListImpl::GetInstance(
                                 chrome::HOST_DESKTOP_TYPE_NATIVE)) {
   }
 
@@ -65,7 +66,7 @@ class AppControllerWebAppBrowserTest : public InProcessBrowserTest {
   }
 
   // Mac only has the native desktop.
-  const BrowserList* native_browser_list;
+  const chrome::BrowserListImpl* native_browser_list;
 };
 
 // Test that in web app mode a reopen event opens the app URL.
diff --git a/chrome/browser/automation/automation_provider_observers.cc b/chrome/browser/automation/automation_provider_observers.cc
index bf80305..4e7dffd 100644
--- a/chrome/browser/automation/automation_provider_observers.cc
+++ b/chrome/browser/automation/automation_provider_observers.cc
@@ -55,7 +55,7 @@
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_iterator.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/find_bar/find_notification_details.h"
 #include "chrome/browser/ui/host_desktop.h"
@@ -821,7 +821,7 @@ void BrowserClosedNotificationObserver::Observe(
   }
 
   // The automation layer doesn't support non-native desktops.
-  int browser_count = static_cast<int>(BrowserList::GetInstance(
+  int browser_count = static_cast<int>(chrome::BrowserListImpl::GetInstance(
                           chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
   // We get the notification before the browser is removed from the BrowserList.
   bool app_closing = browser_count == 1;
@@ -871,7 +871,7 @@ void BrowserCountChangeNotificationObserver::Observe(
          type == chrome::NOTIFICATION_BROWSER_CLOSED);
 
   // The automation layer doesn't support non-native desktops.
-  int current_count = static_cast<int>(BrowserList::GetInstance(
+  int current_count = static_cast<int>(chrome::BrowserListImpl::GetInstance(
                           chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
   if (type == chrome::NOTIFICATION_BROWSER_CLOSED) {
     // At the time of the notification the browser being closed is not removed
diff --git a/chrome/browser/automation/automation_util.cc b/chrome/browser/automation/automation_util.cc
index 97978f21..b844bac 100644
--- a/chrome/browser/automation/automation_util.cc
+++ b/chrome/browser/automation/automation_util.cc
@@ -27,7 +27,7 @@
 #include "chrome/browser/ui/app_modal_dialogs/app_modal_dialog_queue.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_iterator.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/view_type_utils.h"
@@ -156,8 +156,8 @@ namespace automation_util {
 
 Browser* GetBrowserAt(int index) {
   // The automation layer doesn't support non-native desktops.
-  BrowserList* native_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
+  chrome::BrowserListImpl* native_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
   if (index < 0 || index >= static_cast<int>(native_list->size()))
     return NULL;
   return native_list->get(index);
diff --git a/chrome/browser/automation/testing_automation_provider.cc b/chrome/browser/automation/testing_automation_provider.cc
index 51edc54..030501c 100644
--- a/chrome/browser/automation/testing_automation_provider.cc
+++ b/chrome/browser/automation/testing_automation_provider.cc
@@ -93,6 +93,7 @@
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_iterator.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
@@ -289,7 +290,8 @@ void TestingAutomationProvider::OnBrowserRemoved(Browser* browser) {
   // want the automation provider (and hence the process) to go away when the
   // last browser goes away.
   // The automation layer doesn't support non-native desktops.
-  if (BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->empty() &&
+  if (chrome::BrowserListImpl::GetInstance(
+          chrome::HOST_DESKTOP_TYPE_NATIVE)->empty() &&
       !CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kKeepAliveForTest)) {
     // If you change this, update Observer for chrome::SESSION_END
@@ -608,7 +610,7 @@ void TestingAutomationProvider::Reload(int handle,
 
 void TestingAutomationProvider::GetBrowserWindowCount(int* window_count) {
   // The automation layer doesn't support non-native desktops.
-  *window_count = static_cast<int>(BrowserList::GetInstance(
+  *window_count = static_cast<int>(chrome::BrowserListImpl::GetInstance(
                       chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
 }
 
@@ -1127,7 +1129,7 @@ void TestingAutomationProvider::GetBrowserWindowCountJSON(
   DictionaryValue dict;
   // The automation layer doesn't support non-native desktops.
   dict.SetInteger("count",
-                  static_cast<int>(BrowserList::GetInstance(
+                  static_cast<int>(chrome::BrowserListImpl::GetInstance(
                       chrome::HOST_DESKTOP_TYPE_NATIVE)->size()));
   AutomationJSONReply(this, reply_message).SendSuccess(&dict);
 }
@@ -1519,7 +1521,7 @@ void TestingAutomationProvider::WaitForBrowserWindowCountToBecome(
     int target_count,
     IPC::Message* reply_message) {
   // The automation layer doesn't support non-native desktops.
-  int current_count = static_cast<int>(BrowserList::GetInstance(
+  int current_count = static_cast<int>(chrome::BrowserListImpl::GetInstance(
                           chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
   if (current_count == target_count) {
     AutomationMsg_WaitForBrowserWindowCountToBecome::WriteReplyParams(
diff --git a/chrome/browser/chromeos/memory/oom_priority_manager.cc b/chrome/browser/chromeos/memory/oom_priority_manager.cc
index 555ae6b..3225299 100644
--- a/chrome/browser/chromeos/memory/oom_priority_manager.cc
+++ b/chrome/browser/chromeos/memory/oom_priority_manager.cc
@@ -28,7 +28,7 @@
 #include "chrome/browser/memory_details.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_iterator.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_iterator.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ -529,8 +529,10 @@ void OomPriorityManager::Observe(int type,
 // 2) last time a tab was selected
 // 3) is the tab currently selected
 void OomPriorityManager::AdjustOomPriorities() {
-  if (BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH)->empty())
+  if (chrome::BrowserListImpl::GetInstance(
+          chrome::HOST_DESKTOP_TYPE_ASH)->empty()) {
     return;
+  }
 
   // Check for a discontinuity in time caused by the machine being suspended.
   if (!last_adjust_time_.is_null()) {
@@ -557,9 +559,9 @@ OomPriorityManager::TabStatsList OomPriorityManager::GetTabStatsOnUIThread() {
   TabStatsList stats_list;
   stats_list.reserve(32);  // 99% of users have < 30 tabs open
   bool browser_active = true;
-  const BrowserList* ash_browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
-  for (BrowserList::const_reverse_iterator browser_iterator =
+  const chrome::BrowserListImpl* ash_browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  for (chrome::BrowserListImpl::const_reverse_iterator browser_iterator =
            ash_browser_list->begin_last_active();
        browser_iterator != ash_browser_list->end_last_active();
        ++browser_iterator) {
diff --git a/chrome/browser/devtools/browser_list_tabcontents_provider.cc b/chrome/browser/devtools/browser_list_tabcontents_provider.cc
index 37de019..0c75c39 100644
--- a/chrome/browser/devtools/browser_list_tabcontents_provider.cc
+++ b/chrome/browser/devtools/browser_list_tabcontents_provider.cc
@@ -12,6 +12,7 @@
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_iterator.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_iterator.h"
@@ -84,8 +85,8 @@ std::string BrowserListTabContentsProvider::GetPageThumbnailData(
 RenderViewHost* BrowserListTabContentsProvider::CreateNewTarget() {
   // TODO(gab): Do not hardcode HOST_DESKTOP_TYPE_NATIVE below once
   // chrome::NewEmptyWindow() above has been made multi-desktop friendly.
-  const BrowserList* browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
+  const chrome::BrowserListImpl* browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
 
   if (browser_list->empty())
     chrome::NewEmptyWindowDeprecated(profile_);
diff --git a/chrome/browser/devtools/devtools_window.cc b/chrome/browser/devtools/devtools_window.cc
index 93722f5..cd928ce 100644
--- a/chrome/browser/devtools/devtools_window.cc
+++ b/chrome/browser/devtools/devtools_window.cc
@@ -27,7 +27,7 @@
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_iterator.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ -822,9 +822,9 @@ void DevToolsWindow::OpenInNewTab(const std::string& url) {
       host_desktop_type = chrome::GetActiveDesktop();
     }
 
-    const BrowserList* browser_list =
-        BrowserList::GetInstance(host_desktop_type);
-    for (BrowserList::const_iterator it = browser_list->begin();
+    const chrome::BrowserListImpl* browser_list =
+        chrome::BrowserListImpl::GetInstance(host_desktop_type);
+    for (chrome::BrowserListImpl::const_iterator it = browser_list->begin();
          it != browser_list->end(); ++it) {
       if ((*it)->type() == Browser::TYPE_TABBED) {
         (*it)->OpenURL(params);
diff --git a/chrome/browser/managed_mode/managed_mode_navigation_observer.cc b/chrome/browser/managed_mode/managed_mode_navigation_observer.cc
index 9579482..1eccab5 100644
--- a/chrome/browser/managed_mode/managed_mode_navigation_observer.cc
+++ b/chrome/browser/managed_mode/managed_mode_navigation_observer.cc
@@ -22,7 +22,7 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/pref_names.h"
@@ -92,7 +92,8 @@ void GoBackToSafety(content::WebContents* web_contents) {
   // If this is the last tab on this desktop, open a new window.
   chrome::HostDesktopType host_desktop_type =
       chrome::GetHostDesktopTypeForNativeView(web_contents->GetNativeView());
-  const BrowserList* browser_list = BrowserList::GetInstance(host_desktop_type);
+  const chrome::BrowserListImpl* browser_list =
+      chrome::BrowserListImpl::GetInstance(host_desktop_type);
   if (browser_list->size() == 1) {
     Browser* browser = browser_list->get(0);
     DCHECK(browser == chrome::FindBrowserWithWebContents(web_contents));
diff --git a/chrome/browser/metrics/perf_provider_chromeos.cc b/chrome/browser/metrics/perf_provider_chromeos.cc
index c3f5bef..303fada 100644
--- a/chrome/browser/metrics/perf_provider_chromeos.cc
+++ b/chrome/browser/metrics/perf_provider_chromeos.cc
@@ -41,8 +41,9 @@ namespace metrics {
 // is destroyed.
 class WindowedIncognitoObserver : public chrome::BrowserListObserver {
  public:
-  WindowedIncognitoObserver() : incognito_launched_(false) {
-    BrowserList::AddObserver(this);
+  WindowedIncognitoObserver()
+      : incognito_launched_(false) {
+      BrowserList::AddObserver(this);
   }
 
   virtual ~WindowedIncognitoObserver() {
diff --git a/chrome/browser/metro_viewer/metro_viewer_process_host_win.cc b/chrome/browser/metro_viewer/metro_viewer_process_host_win.cc
index 3ed753a..c0e8a6b 100644
--- a/chrome/browser/metro_viewer/metro_viewer_process_host_win.cc
+++ b/chrome/browser/metro_viewer/metro_viewer_process_host_win.cc
@@ -8,7 +8,7 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/ui/ash/ash_init.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ -22,11 +22,11 @@
 namespace {
 
 void CloseOpenAshBrowsers() {
-  BrowserList* browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  chrome::BrowserListImpl* browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
   if (browser_list) {
-    for (BrowserList::const_iterator i = browser_list->begin();
-         i != browser_list->end(); ++i) {
+    for (chrome::BrowserListImpl::const_iterator i = browser_list->begin();
+            i != browser_list->end(); ++i) {
       Browser* browser = *i;
       browser->window()->Close();
       // If the attempt to Close the browser fails due to unload handlers on
diff --git a/chrome/browser/policy/policy_browsertest.cc b/chrome/browser/policy/policy_browsertest.cc
index 3b98fbd..6406679 100644
--- a/chrome/browser/policy/policy_browsertest.cc
+++ b/chrome/browser/policy/policy_browsertest.cc
@@ -50,6 +50,7 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/host_desktop.h"
@@ -1313,8 +1314,8 @@ IN_PROC_BROWSER_TEST_F(PolicyTest, IncognitoEnabled) {
   // Verifies that incognito windows can't be opened when disabled by policy.
 
   // Only test this on the native desktop.
-  const BrowserList* native_browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
+  const chrome::BrowserListImpl* native_browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
 
   // Disable incognito via policy and verify that incognito windows can't be
   // opened.
diff --git a/chrome/browser/sessions/session_restore_browsertest.cc b/chrome/browser/sessions/session_restore_browsertest.cc
index 385de9f9..f934e99 100644
--- a/chrome/browser/sessions/session_restore_browsertest.cc
+++ b/chrome/browser/sessions/session_restore_browsertest.cc
@@ -21,7 +21,7 @@
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/host_desktop.h"
@@ -48,7 +48,7 @@
 class SessionRestoreTest : public InProcessBrowserTest {
  public:
   SessionRestoreTest()
-      : native_browser_list(BrowserList::GetInstance(
+      : native_browser_list(chrome::BrowserListImpl::GetInstance(
                                 chrome::HOST_DESKTOP_TYPE_NATIVE)) {
   }
 
@@ -169,7 +169,7 @@ class SessionRestoreTest : public InProcessBrowserTest {
   GURL url3_;
 
   // The SessionRestore browser tests only uses the native desktop for now.
-  const BrowserList* native_browser_list;
+  const chrome::BrowserListImpl* native_browser_list;
 };
 
 #if defined(OS_CHROMEOS)
diff --git a/chrome/browser/sessions/tab_restore_browsertest.cc b/chrome/browser/sessions/tab_restore_browsertest.cc
index fb8bf52..ea72074 100644
--- a/chrome/browser/sessions/tab_restore_browsertest.cc
+++ b/chrome/browser/sessions/tab_restore_browsertest.cc
@@ -10,7 +10,7 @@
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/find_bar/find_notification_details.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ -34,7 +34,7 @@
 class TabRestoreTest : public InProcessBrowserTest {
  public:
   TabRestoreTest()
-      : native_browser_list(BrowserList::GetInstance(
+      : native_browser_list(chrome::BrowserListImpl::GetInstance(
                                 chrome::HOST_DESKTOP_TYPE_NATIVE)) {
     url1_ = ui_test_utils::GetTestUrl(
         base::FilePath().AppendASCII("session_history"),
@@ -148,7 +148,7 @@ class TabRestoreTest : public InProcessBrowserTest {
   GURL url2_;
 
   // The TabRestore browser tests only uses the native desktop for now.
-  const BrowserList* native_browser_list;
+  const chrome::BrowserListImpl* native_browser_list;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TabRestoreTest);
diff --git a/chrome/browser/ui/ash/launcher/app_shortcut_launcher_item_controller.cc b/chrome/browser/ui/ash/launcher/app_shortcut_launcher_item_controller.cc
index 2ce5659..6d866da 100644
--- a/chrome/browser/ui/ash/launcher/app_shortcut_launcher_item_controller.cc
+++ b/chrome/browser/ui/ash/launcher/app_shortcut_launcher_item_controller.cc
@@ -13,7 +13,7 @@
 #include "chrome/browser/ui/ash/launcher/launcher_item_controller.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/extensions/native_app_window.h"
 #include "chrome/browser/ui/host_desktop.h"
@@ -149,9 +149,9 @@ AppShortcutLauncherItemController::GetRunningApplications() {
   if (!extension)
     return items;
 
-  const BrowserList* ash_browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
-  for (BrowserList::const_reverse_iterator it =
+  const chrome::BrowserListImpl* ash_browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  for (chrome::BrowserListImpl::const_reverse_iterator it =
            ash_browser_list->begin_last_active();
        it != ash_browser_list->end_last_active(); ++it) {
     Browser* browser = *it;
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.cc
index 59b8ed4..685f8fb 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.cc
@@ -39,6 +39,7 @@
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
@@ -1162,7 +1163,7 @@ void ChromeLauncherControllerPerApp::UpdateBrowserItemStatus() {
   aura::Window* window = ash::wm::GetActiveWindow();
   if (window && chrome::FindBrowserWithWindow(window)) {
     browser_status = ash::STATUS_ACTIVE;
-  } else if (!BrowserList::GetInstance(
+  } else if (!chrome::BrowserListImpl::GetInstance(
                  chrome::HOST_DESKTOP_TYPE_ASH)->empty()) {
     browser_status = ash::STATUS_RUNNING;
   } else {
@@ -1434,10 +1435,10 @@ ChromeLauncherControllerPerApp::GetBrowserApplicationList() {
   items.push_back(new ChromeLauncherAppMenuItem(
       l10n_util::GetStringFUTF16(IDS_LAUNCHER_CHROME_BROWSER_NAME,
           l10n_util::GetStringUTF16(IDS_PRODUCT_NAME)), NULL));
-  const BrowserList* ash_browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  const chrome::BrowserListImpl* ash_browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
   int index = 1;
-  for (BrowserList::const_reverse_iterator it =
+  for (chrome::BrowserListImpl::const_reverse_iterator it =
            ash_browser_list->begin_last_active();
        it != ash_browser_list->end_last_active(); ++it, ++index) {
     Browser* browser = *it;
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index d206c55..1bde2f4 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -95,6 +95,7 @@
 #include "chrome/browser/ui/browser_instant_controller.h"
 #include "chrome/browser/ui/browser_iterator.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_tab_contents.h"
 #include "chrome/browser/ui/browser_tab_restore_service_delegate.h"
@@ -631,7 +632,7 @@ void Browser::OnWindowClosing() {
       browser_shutdown::IsTryingToQuit() || !chrome::WillKeepAlive();
 
   if (should_quit_if_last_browser &&
-      BrowserList::GetInstance(host_desktop_type_)->size() == 1) {
+      chrome::BrowserListImpl::GetInstance(host_desktop_type_)->size() == 1) {
     browser_shutdown::OnShutdownStarting(browser_shutdown::WINDOW_CLOSE);
   }
 
diff --git a/chrome/browser/ui/browser_finder.cc b/chrome/browser/ui/browser_finder.cc
index 0ee386c..55e5480 100644
--- a/chrome/browser/ui/browser_finder.cc
+++ b/chrome/browser/ui/browser_finder.cc
@@ -6,7 +6,7 @@
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_iterator.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_iterator.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ -84,7 +84,8 @@ Browser* FindBrowserWithTabbedOrAnyType(Profile* profile,
                                         chrome::HostDesktopType desktop_type,
                                         bool match_tabbed,
                                         bool match_original_profiles) {
-  BrowserList* browser_list_impl = BrowserList::GetInstance(desktop_type);
+  chrome::BrowserListImpl* browser_list_impl =
+      chrome::BrowserListImpl::GetInstance(desktop_type);
   if (!browser_list_impl)
     return NULL;
   uint32 match_types = kMatchAny;
@@ -108,10 +109,11 @@ Browser* FindBrowserWithTabbedOrAnyType(Profile* profile,
 size_t GetBrowserCountImpl(Profile* profile,
                            chrome::HostDesktopType desktop_type,
                            uint32 match_types) {
-  BrowserList* browser_list_impl = BrowserList::GetInstance(desktop_type);
+  chrome::BrowserListImpl* browser_list_impl =
+      chrome::BrowserListImpl::GetInstance(desktop_type);
   size_t count = 0;
   if (browser_list_impl) {
-    for (BrowserList::const_iterator i = browser_list_impl->begin();
+    for (chrome::BrowserListImpl::const_iterator i = browser_list_impl->begin();
          i != browser_list_impl->end(); ++i) {
       if (BrowserMatches(*i, profile, Browser::FEATURE_NONE, match_types))
         count++;
@@ -181,7 +183,7 @@ Browser* FindBrowserWithWebContents(const WebContents* web_contents) {
 }
 
 Browser* FindLastActiveWithProfile(Profile* profile, HostDesktopType type) {
-  BrowserList* list = BrowserList::GetInstance(type);
+  BrowserListImpl* list = BrowserListImpl::GetInstance(type);
   // We are only interested in last active browsers, so we don't fall back to
   // all browsers like FindBrowserWith* do.
   return FindBrowserMatching(list->begin_last_active(), list->end_last_active(),
@@ -189,7 +191,7 @@ Browser* FindLastActiveWithProfile(Profile* profile, HostDesktopType type) {
 }
 
 Browser* FindLastActiveWithHostDesktopType(HostDesktopType type) {
-  BrowserList* browser_list_impl = BrowserList::GetInstance(type);
+  BrowserListImpl* browser_list_impl = BrowserListImpl::GetInstance(type);
   if (browser_list_impl)
     return browser_list_impl->GetLastActive();
   return NULL;
@@ -199,7 +201,7 @@ size_t GetTotalBrowserCount() {
   size_t count = 0;
   for (HostDesktopType t = HOST_DESKTOP_TYPE_FIRST; t < HOST_DESKTOP_TYPE_COUNT;
        t = static_cast<HostDesktopType>(t + 1)) {
-    count += BrowserList::GetInstance(t)->size();
+    count += BrowserListImpl::GetInstance(t)->size();
   }
   return count;
 }
diff --git a/chrome/browser/ui/browser_iterator.cc b/chrome/browser/ui/browser_iterator.cc
index 96df7fd..73571d5 100644
--- a/chrome/browser/ui/browser_iterator.cc
+++ b/chrome/browser/ui/browser_iterator.cc
@@ -7,7 +7,8 @@
 namespace chrome {
 
 BrowserIterator::BrowserIterator()
-    : current_browser_list_(BrowserList::GetInstance(HOST_DESKTOP_TYPE_FIRST)),
+    : current_browser_list_(
+          BrowserListImpl::GetInstance(HOST_DESKTOP_TYPE_FIRST)),
       current_iterator_(current_browser_list_->begin()),
       next_desktop_type_(
           static_cast<HostDesktopType>(HOST_DESKTOP_TYPE_FIRST + 1)) {
@@ -23,7 +24,7 @@ void BrowserIterator::NextBrowserListIfAtEnd() {
   // Make sure either |current_iterator_| is valid or done().
   while (current_iterator_ == current_browser_list_->end() &&
          next_desktop_type_ < HOST_DESKTOP_TYPE_COUNT) {
-    current_browser_list_ = BrowserList::GetInstance(next_desktop_type_);
+    current_browser_list_ = BrowserListImpl::GetInstance(next_desktop_type_);
     current_iterator_ = current_browser_list_->begin();
     next_desktop_type_ = static_cast<HostDesktopType>(next_desktop_type_ + 1);
   }
diff --git a/chrome/browser/ui/browser_iterator.h b/chrome/browser/ui/browser_iterator.h
index 387fcc0..91ea8e8 100644
--- a/chrome/browser/ui/browser_iterator.h
+++ b/chrome/browser/ui/browser_iterator.h
@@ -5,7 +5,7 @@
 #ifndef CHROME_BROWSER_UI_BROWSER_ITERATOR_H_
 #define CHROME_BROWSER_UI_BROWSER_ITERATOR_H_
 
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/host_desktop.h"
 
 class Browser;
@@ -14,7 +14,7 @@ namespace chrome {
 
 // Iterates over all existing browsers (potentially across multiple desktops).
 // Note: to iterate only over the browsers of a specific desktop, use the
-// const_iterator of a given BrowserList instead.
+// const_iterator of a given BrowserListImpl instead.
 //
 // Example:
 //   for (BrowserIterator iterator; !iterator.done(); iterator.Next()) {
@@ -52,12 +52,12 @@ class BrowserIterator {
   // |current_iterator_| is valid or done().
   void NextBrowserListIfAtEnd();
 
-  // The BrowserList currently being iterated over. Instances of this class do
-  // not own this pointer.
-  BrowserList* current_browser_list_;
+  // The BrowserListImpl currently being iterated over. Instances of this class
+  // do not own this pointer.
+  BrowserListImpl* current_browser_list_;
 
   // The underlying iterator over browsers in |current_browser_list_|.
-  BrowserList::const_iterator current_iterator_;
+  BrowserListImpl::const_iterator current_iterator_;
 
   // The next HostDesktopType to iterate over when |current_iterator_| reaches
   // |current_browser_list_->end()|.
diff --git a/chrome/browser/ui/browser_iterator_unittest.cc b/chrome/browser/ui/browser_iterator_unittest.cc
index 7f30a14..33d3be2 100644
--- a/chrome/browser/ui/browser_iterator_unittest.cc
+++ b/chrome/browser/ui/browser_iterator_unittest.cc
@@ -5,7 +5,7 @@
 #include "chrome/browser/ui/browser_iterator.h"
 
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/test/base/browser_with_test_window_test.h"
 
@@ -49,14 +49,14 @@ TEST_F(BrowserIteratorTest, BrowsersOnMultipleDesktops) {
       chrome::CreateBrowserWithTestWindowForParams(&ash_params));
 
   // Sanity checks.
-  BrowserList* native_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
+  chrome::BrowserListImpl* native_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
 #if defined(OS_CHROMEOS)
   // On Chrome OS, the native list and the ash list are the same.
   EXPECT_EQ(5U, native_list->size());
 #else
-  BrowserList* ash_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  chrome::BrowserListImpl* ash_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
   EXPECT_EQ(3U, native_list->size());
   EXPECT_EQ(2U, ash_list->size());
 #endif
@@ -76,14 +76,14 @@ TEST_F(BrowserIteratorTest, NoBrowsersOnAshDesktop) {
       chrome::CreateBrowserWithTestWindowForParams(&native_params));
 
   // Sanity checks.
-  BrowserList* native_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
+  chrome::BrowserListImpl* native_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
   EXPECT_EQ(3U, native_list->size());
 #if !defined(OS_CHROMEOS)
   // On non-Chrome OS platforms the Ash list is independent from the native
   // list, double-check that it's empty.
-  BrowserList* ash_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  chrome::BrowserListImpl* ash_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
   EXPECT_EQ(0U, ash_list->size());
 #endif
 
@@ -100,14 +100,14 @@ TEST_F(BrowserIteratorTestWithInitialWindowInAsh, NoBrowsersOnNativeDesktop) {
   scoped_ptr<Browser> browser3(
       chrome::CreateBrowserWithTestWindowForParams(&ash_params));
 
-  BrowserList* ash_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  chrome::BrowserListImpl* ash_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
   EXPECT_EQ(3U, ash_list->size());
 #if !defined(OS_CHROMEOS)
   // On non-Chrome OS platforms the native list is independent from the Ash
   // list; double-check that it's empty.
-  BrowserList* native_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
+  chrome::BrowserListImpl* native_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
   EXPECT_EQ(0U, native_list->size());
 #endif
 
diff --git a/chrome/browser/ui/browser_list.cc b/chrome/browser/ui/browser_list.cc
index 9f8c4b3..42b26e0 100644
--- a/chrome/browser/ui/browser_list.cc
+++ b/chrome/browser/ui/browser_list.cc
@@ -4,20 +4,13 @@
 
 #include "chrome/browser/ui/browser_list.h"
 
-#include <algorithm>
-
-#include "base/logging.h"
-#include "chrome/browser/browser_process.h"
-#include "chrome/browser/browser_shutdown.h"
-#include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_iterator.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_list_observer.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/host_desktop.h"
-#include "chrome/common/chrome_notification_types.h"
-#include "content/public/browser/notification_service.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/login/user_manager.h"
@@ -25,97 +18,42 @@
 
 using content::WebContents;
 
-// static
-// Intentionally leak |observers_| to avoid exit time destructors.
-ObserverList<chrome::BrowserListObserver>* BrowserList::observers_ =
-    new ObserverList<chrome::BrowserListObserver>;
-
-// static
-BrowserList* BrowserList::native_instance_ = NULL;
-BrowserList* BrowserList::ash_instance_ = NULL;
-
-////////////////////////////////////////////////////////////////////////////////
-// BrowserList, public:
+namespace {
 
-Browser* BrowserList::GetLastActive() const {
-  if (!last_active_browsers_.empty())
-    return *(last_active_browsers_.rbegin());
-  return NULL;
+chrome::BrowserListImpl* GetNativeList() {
+  return chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
 }
 
-// static
-BrowserList* BrowserList::GetInstance(chrome::HostDesktopType type) {
-  BrowserList** list = NULL;
-  if (type == chrome::HOST_DESKTOP_TYPE_NATIVE)
-    list = &native_instance_;
-  else if (type == chrome::HOST_DESKTOP_TYPE_ASH)
-    list = &ash_instance_;
-  else
-    NOTREACHED();
-  if (!*list)
-    *list = new BrowserList;
-  return *list;
-}
+}  // namespace
 
 // static
 void BrowserList::AddBrowser(Browser* browser) {
-  DCHECK(browser);
-  // Push |browser| on the appropriate list instance.
-  BrowserList* browser_list = GetInstance(browser->host_desktop_type());
-  browser_list->browsers_.push_back(browser);
-
-  g_browser_process->AddRefModule();
-
-  content::NotificationService::current()->Notify(
-      chrome::NOTIFICATION_BROWSER_OPENED,
-      content::Source<Browser>(browser),
-      content::NotificationService::NoDetails());
-
-  FOR_EACH_OBSERVER(chrome::BrowserListObserver, *observers_,
-                    OnBrowserAdded(browser));
+  chrome::BrowserListImpl::GetInstance(browser->host_desktop_type())->
+      AddBrowser(browser);
 }
 
 // static
 void BrowserList::RemoveBrowser(Browser* browser) {
-  // Remove |browser| from the appropriate list instance.
-  BrowserList* browser_list = GetInstance(browser->host_desktop_type());
-  RemoveBrowserFrom(browser, &browser_list->last_active_browsers_);
-
-  content::NotificationService::current()->Notify(
-      chrome::NOTIFICATION_BROWSER_CLOSED,
-      content::Source<Browser>(browser),
-      content::NotificationService::NoDetails());
-
-  RemoveBrowserFrom(browser, &browser_list->browsers_);
-
-  FOR_EACH_OBSERVER(chrome::BrowserListObserver, *observers_,
-                    OnBrowserRemoved(browser));
-
-  g_browser_process->ReleaseModule();
-
-  // If we're exiting, send out the APP_TERMINATING notification to allow other
-  // modules to shut themselves down.
-  if (browser_list->browsers_.empty() &&
-      (browser_shutdown::IsTryingToQuit() ||
-       g_browser_process->IsShuttingDown())) {
-    // Last browser has just closed, and this is a user-initiated quit or there
-    // is no module keeping the app alive, so send out our notification. No need
-    // to call ProfileManager::ShutdownSessionServices() as part of the
-    // shutdown, because Browser::WindowClosing() already makes sure that the
-    // SessionService is created and notified.
-    chrome::NotifyAppTerminating();
-    chrome::OnAppExiting();
-  }
+  chrome::BrowserListImpl::GetInstance(browser->host_desktop_type())->
+      RemoveBrowser(browser);
 }
 
 // static
 void BrowserList::AddObserver(chrome::BrowserListObserver* observer) {
-  observers_->AddObserver(observer);
+  for (chrome::HostDesktopType t = chrome::HOST_DESKTOP_TYPE_FIRST;
+       t < chrome::HOST_DESKTOP_TYPE_COUNT;
+       t = static_cast<chrome::HostDesktopType>(t + 1)) {
+    chrome::BrowserListImpl::GetInstance(t)->AddObserver(observer);
+  }
 }
 
 // static
 void BrowserList::RemoveObserver(chrome::BrowserListObserver* observer) {
-  observers_->RemoveObserver(observer);
+  for (chrome::HostDesktopType t = chrome::HOST_DESKTOP_TYPE_FIRST;
+       t < chrome::HOST_DESKTOP_TYPE_COUNT;
+       t = static_cast<chrome::HostDesktopType>(t + 1)) {
+    chrome::BrowserListImpl::GetInstance(t)->RemoveObserver(observer);
+  }
 }
 
 void BrowserList::CloseAllBrowsersWithProfile(Profile* profile) {
@@ -133,13 +71,8 @@ void BrowserList::CloseAllBrowsersWithProfile(Profile* profile) {
 
 // static
 void BrowserList::SetLastActive(Browser* browser) {
-  BrowserList* browser_list = GetInstance(browser->host_desktop_type());
-
-  RemoveBrowserFrom(browser, &browser_list->last_active_browsers_);
-  browser_list->last_active_browsers_.push_back(browser);
-
-  FOR_EACH_OBSERVER(chrome::BrowserListObserver, *observers_,
-                    OnBrowserSetLastActive(browser));
+  chrome::BrowserListImpl::GetInstance(browser->host_desktop_type())->
+      SetLastActive(browser);
 }
 
 // static
@@ -167,21 +100,3 @@ bool BrowserList::IsOffTheRecordSessionActiveForProfile(Profile* profile) {
   }
   return false;
 }
-
-////////////////////////////////////////////////////////////////////////////////
-// BrowserList, private:
-
-BrowserList::BrowserList() {
-}
-
-BrowserList::~BrowserList() {
-}
-
-// static
-void BrowserList::RemoveBrowserFrom(Browser* browser,
-                                    BrowserVector* browser_list) {
-  BrowserVector::iterator remove_browser =
-      std::find(browser_list->begin(), browser_list->end(), browser);
-  if (remove_browser != browser_list->end())
-    browser_list->erase(remove_browser);
-}
diff --git a/chrome/browser/ui/browser_list.h b/chrome/browser/ui/browser_list.h
index 215dece..b969ab3f 100644
--- a/chrome/browser/ui/browser_list.h
+++ b/chrome/browser/ui/browser_list.h
@@ -8,8 +8,6 @@
 #include <vector>
 
 #include "base/basictypes.h"
-#include "base/observer_list.h"
-#include "chrome/browser/ui/host_desktop.h"
 
 class Browser;
 class Profile;
@@ -18,56 +16,23 @@ namespace chrome {
 class BrowserListObserver;
 }
 
-// Maintains a list of Browser objects present in a given HostDesktop (see
-// HostDesktopType).
+// Stores a list of all Browser objects.
 class BrowserList {
  public:
   typedef std::vector<Browser*> BrowserVector;
-  typedef BrowserVector::const_iterator const_iterator;
-  typedef BrowserVector::const_reverse_iterator const_reverse_iterator;
 
-  // Returns the last active browser for this list.
-  Browser* GetLastActive() const;
-
-  // Browsers are added to the list before they have constructed windows,
-  // so the |window()| member function may return NULL.
-  const_iterator begin() const { return browsers_.begin(); }
-  const_iterator end() const { return browsers_.end(); }
-
-  bool empty() const { return browsers_.empty(); }
-  size_t size() const { return browsers_.size(); }
-
-  Browser* get(size_t index) const { return browsers_[index]; }
-
-  // Returns iterated access to list of open browsers ordered by when
-  // they were last active. The underlying data structure is a vector
-  // and we push_back on recent access so a reverse iterator gives the
-  // latest accessed browser first.
-  const_reverse_iterator begin_last_active() const {
-    return last_active_browsers_.rbegin();
-  }
-  const_reverse_iterator end_last_active() const {
-    return last_active_browsers_.rend();
-  }
-
-  static BrowserList* GetInstance(chrome::HostDesktopType type);
-
-  // Adds or removes |browser| from the list it is associated with. The browser
-  // object should be valid BEFORE these calls (for the benefit of observers),
-  // so notify and THEN delete the object.
+  // Adds and removes browsers from the list they are associated with. The
+  // browser object should be valid BEFORE these calls (for the benefit of
+  // observers), so notify and THEN delete the object.
   static void AddBrowser(Browser* browser);
   static void RemoveBrowser(Browser* browser);
 
-  // Adds and removes |observer| from the observer list for all desktops.
-  // Observers are responsible for making sure the notifying browser is relevant
-  // to them (e.g., on the specific desktop they care about if any).
+  // Adds and removes |observer| from the observer list of each desktop.
   static void AddObserver(chrome::BrowserListObserver* observer);
   static void RemoveObserver(chrome::BrowserListObserver* observer);
 
   // Called by Browser objects when their window is activated (focused).  This
-  // allows us to determine what the last active Browser was on each desktop.
-  // Note: This only takes effect on the appropriate browser list as determined
-  // by |browser->host_desktop_type()|.
+  // allows us to determine what the last active Browser was.
   static void SetLastActive(Browser* browser);
 
   // Closes all browsers for |profile| across all desktops.
@@ -80,29 +45,6 @@ class BrowserList {
   // Returns true if at least one incognito session is active for |profile|
   // across all desktops.
   static bool IsOffTheRecordSessionActiveForProfile(Profile* profile);
-
- private:
-  BrowserList();
-  ~BrowserList();
-
-  // Helper method to remove a browser instance from a list of browsers
-  static void RemoveBrowserFrom(Browser* browser, BrowserVector* browser_list);
-
-  // A vector of the browsers in this list, in the order they were added.
-  BrowserVector browsers_;
-  // A vector of the browsers in this list that have been activated, in the
-  // reverse order in which they were last activated.
-  BrowserVector last_active_browsers_;
-
-  // A list of observers which will be notified of every browser addition and
-  // removal across all BrowserLists.
-  static ObserverList<chrome::BrowserListObserver>* observers_;
-
-  // Nothing fancy, since we only have two HDTs.
-  static BrowserList* native_instance_;
-  static BrowserList* ash_instance_;
-
-  DISALLOW_COPY_AND_ASSIGN(BrowserList);
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_LIST_H_
diff --git a/chrome/browser/ui/browser_list_impl.cc b/chrome/browser/ui/browser_list_impl.cc
new file mode 100644
index 0000000..82b47f5
--- /dev/null
+++ b/chrome/browser/ui/browser_list_impl.cc
@@ -0,0 +1,131 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/browser_list_impl.h"
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/browser_shutdown.h"
+#include "chrome/browser/lifetime/application_lifetime.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_list_observer.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/chrome_switches.h"
+#include "content/public/browser/notification_service.h"
+
+// #include "build/build_config.h"
+// #include "base/prefs/pref_service.h"
+
+namespace chrome {
+
+// static
+BrowserListImpl* BrowserListImpl::native_instance_ = NULL;
+BrowserListImpl* BrowserListImpl::ash_instance_ = NULL;
+
+////////////////////////////////////////////////////////////////////////////////
+// BrowserListImpl, public:
+
+// static
+BrowserListImpl* BrowserListImpl::GetInstance(HostDesktopType type) {
+  BrowserListImpl** list = NULL;
+  if (type == HOST_DESKTOP_TYPE_NATIVE)
+    list = &native_instance_;
+  else if (type == HOST_DESKTOP_TYPE_ASH)
+    list = &ash_instance_;
+  else
+    NOTREACHED();
+  if (!*list)
+    *list = new BrowserListImpl;
+  return *list;
+}
+
+void BrowserListImpl::AddBrowser(Browser* browser) {
+  DCHECK(browser);
+  browsers_.push_back(browser);
+
+  g_browser_process->AddRefModule();
+
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_BROWSER_OPENED,
+      content::Source<Browser>(browser),
+      content::NotificationService::NoDetails());
+
+  // Send out notifications after add has occurred. Do some basic checking to
+  // try to catch evil observers that change the list from under us.
+  size_t original_count = observers_.size();
+  FOR_EACH_OBSERVER(BrowserListObserver, observers_, OnBrowserAdded(browser));
+  DCHECK_EQ(original_count, observers_.size())
+      << "observer list modified during notification";
+}
+
+void BrowserListImpl::RemoveBrowser(Browser* browser) {
+  RemoveBrowserFrom(browser, &last_active_browsers_);
+
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_BROWSER_CLOSED,
+      content::Source<Browser>(browser),
+      content::NotificationService::NoDetails());
+
+  RemoveBrowserFrom(browser, &browsers_);
+
+  FOR_EACH_OBSERVER(BrowserListObserver, observers_, OnBrowserRemoved(browser));
+
+  g_browser_process->ReleaseModule();
+
+  // If we're exiting, send out the APP_TERMINATING notification to allow other
+  // modules to shut themselves down.
+  if (browsers_.empty() &&
+      (browser_shutdown::IsTryingToQuit() ||
+       g_browser_process->IsShuttingDown())) {
+    // Last browser has just closed, and this is a user-initiated quit or there
+    // is no module keeping the app alive, so send out our notification. No need
+    // to call ProfileManager::ShutdownSessionServices() as part of the
+    // shutdown, because Browser::WindowClosing() already makes sure that the
+    // SessionService is created and notified.
+    chrome::NotifyAppTerminating();
+    chrome::OnAppExiting();
+  }
+}
+
+void BrowserListImpl::AddObserver(BrowserListObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void BrowserListImpl::RemoveObserver(BrowserListObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void BrowserListImpl::SetLastActive(Browser* browser) {
+  RemoveBrowserFrom(browser, &last_active_browsers_);
+  last_active_browsers_.push_back(browser);
+
+  FOR_EACH_OBSERVER(BrowserListObserver, observers_,
+                    OnBrowserSetLastActive(browser));
+}
+
+Browser* BrowserListImpl::GetLastActive() const {
+  if (!last_active_browsers_.empty())
+    return *(last_active_browsers_.rbegin());
+  return NULL;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// BrowserListImpl, private:
+
+BrowserListImpl::BrowserListImpl() {
+}
+
+BrowserListImpl::~BrowserListImpl() {
+}
+
+void BrowserListImpl::RemoveBrowserFrom(Browser* browser,
+                                        BrowserVector* browser_list) {
+  const iterator remove_browser =
+      std::find(browser_list->begin(), browser_list->end(), browser);
+  if (remove_browser != browser_list->end())
+    browser_list->erase(remove_browser);
+}
+
+}  // namespace chrome
diff --git a/chrome/browser/ui/browser_list_impl.h b/chrome/browser/ui/browser_list_impl.h
new file mode 100644
index 0000000..d7107e3
--- /dev/null
+++ b/chrome/browser/ui/browser_list_impl.h
@@ -0,0 +1,92 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_BROWSER_LIST_IMPL_H_
+#define CHROME_BROWSER_UI_BROWSER_LIST_IMPL_H_
+
+#include "base/observer_list.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/host_desktop.h"
+
+class Browser;
+class Profile;
+
+namespace chrome {
+
+class BrowserListObserver;
+
+// Maintains a list of Browser objects present in a given HostDesktop (see
+// HostDesktopType).
+class BrowserListImpl {
+ public:
+  typedef std::vector<Browser*> BrowserVector;
+  typedef BrowserVector::iterator iterator;
+  typedef BrowserVector::const_iterator const_iterator;
+  typedef BrowserVector::const_reverse_iterator const_reverse_iterator;
+
+  static BrowserListImpl* GetInstance(HostDesktopType type);
+
+  // Adds and removes browsers from the global list. The browser object should
+  // be valid BEFORE these calls (for the benefit of observers), so notify and
+  // THEN delete the object.
+  void AddBrowser(Browser* browser);
+  void RemoveBrowser(Browser* browser);
+
+  // Called by Browser objects when their window is activated (focused).  This
+  // allows us to determine what the last active Browser was.
+  void SetLastActive(Browser* browser);
+
+  Browser* GetLastActive() const;
+
+  // Browsers are added to the list before they have constructed windows,
+  // so the |window()| member function may return NULL.
+  const_iterator begin() const { return browsers_.begin(); }
+  const_iterator end() const { return browsers_.end(); }
+
+  bool empty() const { return browsers_.empty(); }
+  size_t size() const { return browsers_.size(); }
+
+  Browser* get(size_t index) const { return browsers_[index]; }
+
+  // Returns iterated access to list of open browsers ordered by when
+  // they were last active. The underlying data structure is a vector
+  // and we push_back on recent access so a reverse iterator gives the
+  // latest accessed browser first.
+  const_reverse_iterator begin_last_active() const {
+    return last_active_browsers_.rbegin();
+  }
+  const_reverse_iterator end_last_active() const {
+    return last_active_browsers_.rend();
+  }
+
+ private:
+  BrowserListImpl();
+  ~BrowserListImpl();
+
+  // Only callable by BrowserList::(Add|Remove)Observer.
+  // TODO(gab): Merge BrowserListImpl into BrowserList removing the need for
+  // friend.
+  friend void BrowserList::AddObserver(chrome::BrowserListObserver*);
+  friend void BrowserList::RemoveObserver(chrome::BrowserListObserver*);
+  void AddObserver(BrowserListObserver* observer);
+  void RemoveObserver(BrowserListObserver* observer);
+
+  // Helper method to remove a browser instance from a list of browsers
+  void RemoveBrowserFrom(Browser* browser, BrowserVector* browser_list);
+
+  ObserverList<BrowserListObserver> observers_;
+
+  BrowserVector browsers_;
+  BrowserVector last_active_browsers_;
+
+  // Nothing fancy, since we only have two HDTs.
+  static BrowserListImpl* native_instance_;
+  static BrowserListImpl* ash_instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserListImpl);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_UI_BROWSER_LIST_IMPL_H_
diff --git a/chrome/browser/ui/gtk/gtk_util.cc b/chrome/browser/ui/gtk/gtk_util.cc
index 49959a5..d60aacb 100644
--- a/chrome/browser/ui/gtk/gtk_util.cc
+++ b/chrome/browser/ui/gtk/gtk_util.cc
@@ -26,7 +26,7 @@
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_iterator.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/gtk/browser_window_gtk.h"
 #include "chrome/browser/ui/gtk/gtk_theme_service.h"
@@ -431,8 +431,8 @@ void MakeAppModalWindowGroup() {
 
 void AppModalDismissedUngroupWindows() {
   // GTK only has the native desktop.
-  const BrowserList* native_browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
+  const chrome::BrowserListImpl* native_browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
   if (!native_browser_list->empty()) {
     std::vector<GtkWindow*> transient_windows;
 
diff --git a/chrome/browser/ui/host_desktop.cc b/chrome/browser/ui/host_desktop.cc
index d1ac55c..50900ca 100644
--- a/chrome/browser/ui/host_desktop.cc
+++ b/chrome/browser/ui/host_desktop.cc
@@ -11,7 +11,7 @@
 #include "ash/shell.h"
 #include "chrome/browser/ui/ash/ash_util.h"
 #include "chrome/browser/ui/aura/active_desktop_monitor.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 
 namespace chrome {
 
@@ -79,8 +79,10 @@ HostDesktopType GetHostDesktopTypeForBrowser(const Browser* browser) {
   for (HostDesktopType type = HOST_DESKTOP_TYPE_FIRST;
       type < HOST_DESKTOP_TYPE_COUNT;
       type = static_cast<HostDesktopType>(type + 1)) {
-    BrowserList::const_iterator begin = BrowserList::GetInstance(type)->begin();
-    BrowserList::const_iterator end = BrowserList::GetInstance(type)->end();
+    BrowserListImpl::const_iterator begin =
+        BrowserListImpl::GetInstance(type)->begin();
+    BrowserListImpl::const_iterator end =
+        BrowserListImpl::GetInstance(type)->end();
     if (std::find(begin, end, browser) != end)
       return type;
   }
diff --git a/chrome/browser/ui/tab_contents/tab_contents_iterator_unittest.cc b/chrome/browser/ui/tab_contents/tab_contents_iterator_unittest.cc
index 8b3675f0..110bf2f 100644
--- a/chrome/browser/ui/tab_contents/tab_contents_iterator_unittest.cc
+++ b/chrome/browser/ui/tab_contents/tab_contents_iterator_unittest.cc
@@ -11,7 +11,7 @@
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/pref_names.h"
@@ -35,8 +35,8 @@ size_t CountAllTabs() {
 
 TEST_F(BrowserListTest, TabContentsIteratorVerifyCount) {
   // Make sure we have 1 window to start with.
-  EXPECT_EQ(1U,
-            BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
+  EXPECT_EQ(1U, chrome::BrowserListImpl::GetInstance(
+                    chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
 
   EXPECT_EQ(0U, CountAllTabs());
 
@@ -56,13 +56,13 @@ TEST_F(BrowserListTest, TabContentsIteratorVerifyCount) {
   // Sanity checks.
 #if defined(OS_CHROMEOS)
   // The ash desktop is the native desktop on Chrome OS.
-  EXPECT_EQ(4U,
-            BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
+  EXPECT_EQ(4U, chrome::BrowserListImpl::GetInstance(
+                    chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
 #else
-  EXPECT_EQ(2U,
-            BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
-  EXPECT_EQ(2U,
-            BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH)->size());
+  EXPECT_EQ(2U, chrome::BrowserListImpl::GetInstance(
+                    chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
+  EXPECT_EQ(2U, chrome::BrowserListImpl::GetInstance(
+                    chrome::HOST_DESKTOP_TYPE_ASH)->size());
 #endif
   EXPECT_EQ(0, browser()->tab_strip_model()->count());
   EXPECT_EQ(0, browser2->tab_strip_model()->count());
@@ -94,8 +94,8 @@ TEST_F(BrowserListTest, TabContentsIteratorVerifyCount) {
 
 TEST_F(BrowserListTest, TabContentsIteratorVerifyBrowser) {
   // Make sure we have 1 window to start with.
-  EXPECT_EQ(1U,
-            BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
+  EXPECT_EQ(1U, chrome::BrowserListImpl::GetInstance(
+                    chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
 
   // Create more browsers/windows.
   Browser::CreateParams native_params(profile(),
@@ -111,13 +111,13 @@ TEST_F(BrowserListTest, TabContentsIteratorVerifyBrowser) {
   // Sanity checks.
 #if defined(OS_CHROMEOS)
   // The ash desktop is the native desktop on Chrome OS.
-  EXPECT_EQ(3U,
-            BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
+  EXPECT_EQ(3U, chrome::BrowserListImpl::GetInstance(
+                    chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
 #else
-  EXPECT_EQ(2U,
-            BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
-  EXPECT_EQ(1U,
-            BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH)->size());
+  EXPECT_EQ(2U, chrome::BrowserListImpl::GetInstance(
+                    chrome::HOST_DESKTOP_TYPE_NATIVE)->size());
+  EXPECT_EQ(1U, chrome::BrowserListImpl::GetInstance(
+                    chrome::HOST_DESKTOP_TYPE_ASH)->size());
 #endif
   EXPECT_EQ(0, browser()->tab_strip_model()->count());
   EXPECT_EQ(0, browser2->tab_strip_model()->count());
diff --git a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
index 63617cd..a28641b 100644
--- a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
+++ b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
@@ -12,7 +12,7 @@
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_iterator.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
@@ -143,7 +143,7 @@ using test::IDString;
 using test::GetTabStripForBrowser;
 
 TabDragControllerTest::TabDragControllerTest()
-    : native_browser_list(BrowserList::GetInstance(
+    : native_browser_list(chrome::BrowserListImpl::GetInstance(
                               chrome::HOST_DESKTOP_TYPE_NATIVE)) {
 }
 
@@ -564,7 +564,7 @@ IN_PROC_BROWSER_TEST_P(DetachToBrowserTabDragControllerTest,
 namespace {
 
 void DeleteSourceDetachedStep2(WebContents* tab,
-                               const BrowserList* browser_list) {
+                               const chrome::BrowserListImpl* browser_list) {
   ASSERT_EQ(2u, browser_list->size());
   Browser* new_browser = browser_list->get(1);
   // This ends up closing the source window.
@@ -606,7 +606,8 @@ IN_PROC_BROWSER_TEST_P(DetachToBrowserTabDragControllerTest,
 
 namespace {
 
-void PressEscapeWhileDetachedStep2(const BrowserList* browser_list) {
+void PressEscapeWhileDetachedStep2(
+    const chrome::BrowserListImpl* browser_list) {
   ASSERT_EQ(2u, browser_list->size());
   Browser* new_browser = browser_list->get(1);
   ui_controls::SendKeyPress(
@@ -645,7 +646,7 @@ IN_PROC_BROWSER_TEST_P(DetachToBrowserTabDragControllerTest,
 namespace {
 
 void DragAllStep2(DetachToBrowserTabDragControllerTest* test,
-                  const BrowserList* browser_list) {
+                  const chrome::BrowserListImpl* browser_list) {
   // Should only be one window.
   ASSERT_EQ(1u, browser_list->size());
   if (test->input_source() == INPUT_SOURCE_TOUCH) {
@@ -692,7 +693,7 @@ namespace {
 void DragAllToSeparateWindowStep2(DetachToBrowserTabDragControllerTest* test,
                                   TabStrip* attached_tab_strip,
                                   TabStrip* target_tab_strip,
-                                  const BrowserList* browser_list) {
+                                  const chrome::BrowserListImpl* browser_list) {
   ASSERT_TRUE(attached_tab_strip->IsDragSessionActive());
   ASSERT_FALSE(target_tab_strip->IsDragSessionActive());
   ASSERT_TRUE(TabDragController::IsActive());
@@ -755,7 +756,7 @@ void DragAllToSeparateWindowAndCancelStep2(
     DetachToBrowserTabDragControllerTest* test,
     TabStrip* attached_tab_strip,
     TabStrip* target_tab_strip,
-    const BrowserList* browser_list) {
+    const chrome::BrowserListImpl* browser_list) {
   ASSERT_TRUE(attached_tab_strip->IsDragSessionActive());
   ASSERT_FALSE(target_tab_strip->IsDragSessionActive());
   ASSERT_TRUE(TabDragController::IsActive());
@@ -911,7 +912,7 @@ namespace {
 // Invoked from the nested message loop.
 void CancelOnNewTabWhenDraggingStep2(
     DetachToBrowserTabDragControllerTest* test,
-    const BrowserList* browser_list) {
+    const chrome::BrowserListImpl* browser_list) {
   ASSERT_TRUE(TabDragController::IsActive());
   ASSERT_EQ(2u, browser_list->size());
 
@@ -953,7 +954,7 @@ namespace {
 void DragInMaximizedWindowStep2(DetachToBrowserTabDragControllerTest* test,
                                 Browser* browser,
                                 TabStrip* tab_strip,
-                                const BrowserList* browser_list) {
+                                const chrome::BrowserListImpl* browser_list) {
   // There should be another browser.
   ASSERT_EQ(2u, browser_list->size());
   Browser* new_browser = browser_list->get(1);
@@ -1278,7 +1279,7 @@ class DetachToBrowserInSeparateDisplayAndCancelTabDragControllerTest
 // Invoked from the nested message loop.
 void CancelDragTabToWindowInSeparateDisplayStep3(
     TabStrip* tab_strip,
-    const BrowserList* browser_list) {
+    const chrome::BrowserListImpl* browser_list) {
   ASSERT_FALSE(tab_strip->IsDragSessionActive());
   ASSERT_TRUE(TabDragController::IsActive());
   ASSERT_EQ(2u, browser_list->size());
@@ -1293,7 +1294,7 @@ void CancelDragTabToWindowInSeparateDisplayStep2(
     TabStrip* tab_strip,
     aura::RootWindow* current_root,
     gfx::Point final_destination,
-    const BrowserList* browser_list) {
+    const chrome::BrowserListImpl* browser_list) {
   ASSERT_FALSE(tab_strip->IsDragSessionActive());
   ASSERT_TRUE(TabDragController::IsActive());
   ASSERT_EQ(2u, browser_list->size());
diff --git a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h
index 896770a..3515be1 100644
--- a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h
+++ b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h
@@ -10,10 +10,13 @@
 #include "chrome/test/base/in_process_browser_test.h"
 
 class Browser;
-class BrowserList;
 class TabStrip;
 class TabStripModel;
 
+namespace chrome {
+class BrowserListImpl;
+}
+
 namespace content {
 class WebContents;
 }
@@ -46,7 +49,7 @@ class TabDragControllerTest : public InProcessBrowserTest {
 
   // The tab drag controller interactive ui tests only use the native desktop
   // for now.
-  const BrowserList* native_browser_list;
+  const chrome::BrowserListImpl* native_browser_list;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TabDragControllerTest);
diff --git a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest_win.cc b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest_win.cc
index 4cee28f..3b4709d 100644
--- a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest_win.cc
+++ b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest_win.cc
@@ -9,7 +9,7 @@
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
diff --git a/chrome/browser/ui/window_sizer/window_sizer.cc b/chrome/browser/ui/window_sizer/window_sizer.cc
index 86b9404..2afc78d 100644
--- a/chrome/browser/ui/window_sizer/window_sizer.cc
+++ b/chrome/browser/ui/window_sizer/window_sizer.cc
@@ -11,7 +11,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/ash/ash_init.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/browser_window_state.h"
 #include "chrome/browser/ui/host_desktop.h"
@@ -117,9 +117,10 @@ class DefaultStateProvider : public WindowSizer::StateProvider {
       // GetBoundsOverrideAsh should take over below before this is reached).
       // TODO(gab): This code should go in a native desktop specific window
       // sizer as part of fixing crbug.com/175812.
-      const BrowserList* native_browser_list =
-          BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
-      for (BrowserList::const_reverse_iterator it =
+      const chrome::BrowserListImpl* native_browser_list =
+          chrome::BrowserListImpl::GetInstance(
+              chrome::HOST_DESKTOP_TYPE_NATIVE);
+      for (chrome::BrowserListImpl::const_reverse_iterator it =
                native_browser_list->begin_last_active();
            it != native_browser_list->end_last_active(); ++it) {
         Browser* last_active = *it;
diff --git a/chrome/browser/ui/window_sizer/window_sizer_ash.cc b/chrome/browser/ui/window_sizer/window_sizer_ash.cc
index c080be3..bd834d8 100644
--- a/chrome/browser/ui/window_sizer/window_sizer_ash.cc
+++ b/chrome/browser/ui/window_sizer/window_sizer_ash.cc
@@ -10,7 +10,7 @@
 #include "base/compiler_specific.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/fullscreen/fullscreen_controller.h"
 #include "chrome/browser/ui/host_desktop.h"
@@ -40,9 +40,9 @@ bool IsValidBrowser(Browser* browser, const gfx::Rect& bounds_in_screen) {
 // on the screen defined by |bounds_in_screen| and visible.
 bool IsValidToplevelWindow(aura::Window* window,
                            const gfx::Rect& bounds_in_screen) {
-  const BrowserList* ash_browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
-  for (BrowserList::const_iterator iter = ash_browser_list->begin();
+  const chrome::BrowserListImpl* ash_browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  for (chrome::BrowserListImpl::const_iterator iter = ash_browser_list->begin();
        iter != ash_browser_list->end();
        ++iter) {
     Browser* browser = *iter;
@@ -100,9 +100,9 @@ aura::Window* GetTopWindow(const gfx::Rect& bounds_in_screen) {
 // the |bounds_in_screen| rectangle.
 int GetNumberOfValidTopLevelBrowserWindows(const gfx::Rect& bounds_in_screen) {
   int count = 0;
-  const BrowserList* ash_browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
-  for (BrowserList::const_iterator iter = ash_browser_list->begin();
+  const chrome::BrowserListImpl* ash_browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  for (chrome::BrowserListImpl::const_iterator iter = ash_browser_list->begin();
        iter != ash_browser_list->end();
        ++iter) {
     if (IsValidBrowser(*iter, bounds_in_screen))
diff --git a/chrome/chrome_browser_ui.gypi b/chrome/chrome_browser_ui.gypi
index 2616f8f..271e0c6 100644
--- a/chrome/chrome_browser_ui.gypi
+++ b/chrome/chrome_browser_ui.gypi
@@ -264,6 +264,8 @@
         'browser/ui/browser_iterator.h',
         'browser/ui/browser_list.cc',
         'browser/ui/browser_list.h',
+        'browser/ui/browser_list_impl.cc',
+        'browser/ui/browser_list_impl.h',
         'browser/ui/browser_mac.cc',
         'browser/ui/browser_mac.h',
         'browser/ui/browser_navigator.cc',
diff --git a/chrome/test/base/in_process_browser_test.cc b/chrome/test/base/in_process_browser_test.cc
index 85a3c60..fd04549 100644
--- a/chrome/test/base/in_process_browser_test.cc
+++ b/chrome/test/base/in_process_browser_test.cc
@@ -22,7 +22,7 @@
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
-#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_impl.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/browser_window.h"
@@ -329,8 +329,8 @@ void InProcessBrowserTest::RunTestOnMainThreadLoop() {
 #endif
 
   // Browser tests do not support multi-desktop for now.
-  const BrowserList* native_browser_list =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
+  const chrome::BrowserListImpl* native_browser_list =
+      chrome::BrowserListImpl::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
   if (!native_browser_list->empty()) {
     browser_ = native_browser_list->get(0);
 #if defined(USE_ASH)