Add OVERRIDE to wide swaths of WebUI.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7541022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@94906 0039d316-1c4b-4281-b951-d872f2087c98

49 files changed, 157 insertions, 150 deletions

diff --git a/chrome/browser/browser_signin.cc b/chrome/browser/browser_signin.cc
index 8f4bbd61..2882bb5 100644
--- a/chrome/browser/browser_signin.cc
+++ b/chrome/browser/browser_signin.cc
@@ -79,37 +79,38 @@ class BrowserSigninHtml : public HtmlDialogUIDelegate,
   virtual ~BrowserSigninHtml() {}
 
   // HtmlDialogUIDelegate implementation
-  virtual bool IsDialogModal() const {
+  virtual bool IsDialogModal() const OVERRIDE {
     return false;
   };
-  virtual std::wstring GetDialogTitle() const {
+  virtual std::wstring GetDialogTitle() const OVERRIDE {
     return L"";
   }
-  virtual GURL GetDialogContentURL() const {
+  virtual GURL GetDialogContentURL() const OVERRIDE {
     return GURL("chrome://dialog/signin");
   }
   virtual void GetWebUIMessageHandlers(
-      std::vector<WebUIMessageHandler*>* handlers) const {
+      std::vector<WebUIMessageHandler*>* handlers) const OVERRIDE {
     const WebUIMessageHandler* handler = this;
     handlers->push_back(const_cast<WebUIMessageHandler*>(handler));
   }
-  virtual void GetDialogSize(gfx::Size* size) const {
+  virtual void GetDialogSize(gfx::Size* size) const OVERRIDE {
     size->set_width(600);
     size->set_height(300);
   }
-  virtual std::string GetDialogArgs() const {
+  virtual std::string GetDialogArgs() const OVERRIDE {
     return UTF16ToASCII(login_message_);
   }
-  virtual void OnDialogClosed(const std::string& json_retval) {
+  virtual void OnDialogClosed(const std::string& json_retval) OVERRIDE {
     closed_ = true;
     signin_->Cancel();
   }
-  virtual void OnCloseContents(TabContents* source, bool* out_close_dialog) {
+  virtual void OnCloseContents(TabContents* source,
+                               bool* out_close_dialog) OVERRIDE {
   }
-  virtual bool ShouldShowDialogTitle() const { return true; }
+  virtual bool ShouldShowDialogTitle() const OVERRIDE { return true; }
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // Refreshes the UI, such as after an authentication error.
   void ReloadUI();
diff --git a/chrome/browser/extensions/extensions_ui.h b/chrome/browser/extensions/extensions_ui.h
index 8d130c4..37e27c7 100644
--- a/chrome/browser/extensions/extensions_ui.h
+++ b/chrome/browser/extensions/extensions_ui.h
@@ -56,7 +56,7 @@ class ExtensionsDOMHandler : public WebUIMessageHandler,
   virtual ~ExtensionsDOMHandler();
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // Extension Detail JSON Struct for page. (static for ease of testing).
   // Note: service can be NULL in unit tests.
@@ -69,13 +69,13 @@ class ExtensionsDOMHandler : public WebUIMessageHandler,
 
   // ExtensionPackJob::Client
   virtual void OnPackSuccess(const FilePath& crx_file,
-                             const FilePath& key_file);
+                             const FilePath& key_file) OVERRIDE;
 
-  virtual void OnPackFailure(const std::string& error);
+  virtual void OnPackFailure(const std::string& error) OVERRIDE;
 
   // ExtensionUninstallDialog::Delegate:
-  virtual void ExtensionDialogAccepted();
-  virtual void ExtensionDialogCanceled();
+  virtual void ExtensionDialogAccepted() OVERRIDE;
+  virtual void ExtensionDialogCanceled() OVERRIDE;
 
  private:
   // Callback for "requestExtensionsData" message.
@@ -134,15 +134,15 @@ class ExtensionsDOMHandler : public WebUIMessageHandler,
 
   // SelectFileDialog::Listener
   virtual void FileSelected(const FilePath& path,
-                            int index, void* params);
+                            int index, void* params) OVERRIDE;
   virtual void MultiFilesSelected(
-      const std::vector<FilePath>& files, void* params);
-  virtual void FileSelectionCanceled(void* params) {}
+      const std::vector<FilePath>& files, void* params) OVERRIDE;
+  virtual void FileSelectionCanceled(void* params) OVERRIDE {}
 
   // NotificationObserver
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
   // Helper that lists the current active html pages for an extension.
   std::vector<ExtensionPage> GetActivePagesForExtension(
diff --git a/chrome/browser/printing/cloud_print/cloud_print_setup_message_handler.h b/chrome/browser/printing/cloud_print/cloud_print_setup_message_handler.h
index 064d508..9e18804 100644
--- a/chrome/browser/printing/cloud_print/cloud_print_setup_message_handler.h
+++ b/chrome/browser/printing/cloud_print/cloud_print_setup_message_handler.h
@@ -20,11 +20,11 @@ class CloudPrintSetupMessageHandler : public WebUIMessageHandler {
   virtual ~CloudPrintSetupMessageHandler() {}
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
 
  protected:
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callbacks from the page.
   void HandleSubmitAuth(const ListValue* args);
diff --git a/chrome/browser/ui/login/login_prompt_ui.cc b/chrome/browser/ui/login/login_prompt_ui.cc
index 3306ff2..8c8440a 100644
--- a/chrome/browser/ui/login/login_prompt_ui.cc
+++ b/chrome/browser/ui/login/login_prompt_ui.cc
@@ -82,43 +82,44 @@ class LoginHandlerHtmlDelegate : public HtmlDialogUIDelegate,
   }
 
   // HtmlDialogUIDelegate methods:
-  virtual bool IsDialogModal() const {
+  virtual bool IsDialogModal() const OVERRIDE {
     return true;
   }
 
-  virtual std::wstring GetDialogTitle() const {
+  virtual std::wstring GetDialogTitle() const OVERRIDE {
     return UTF16ToWide(l10n_util::GetStringUTF16(IDS_LOGIN_DIALOG_TITLE));
   }
 
-  virtual GURL GetDialogContentURL() const {
+  virtual GURL GetDialogContentURL() const OVERRIDE {
     return GURL(chrome::kChromeUIHttpAuthURL);
   }
 
   virtual void GetWebUIMessageHandlers(
-      std::vector<WebUIMessageHandler*>* handlers) const {
+      std::vector<WebUIMessageHandler*>* handlers) const OVERRIDE {
     const WebUIMessageHandler* handler = this;
     handlers->push_back(const_cast<WebUIMessageHandler*>(handler));
   }
 
-  virtual void GetDialogSize(gfx::Size* size) const {
+  virtual void GetDialogSize(gfx::Size* size) const OVERRIDE {
     size->set_width(kDialogWidth);
     size->set_height(kDialogHeight);
   }
 
-  virtual std::string GetDialogArgs() const {
+  virtual std::string GetDialogArgs() const OVERRIDE {
     return explanation_;
   }
 
-  virtual void OnDialogClosed(const std::string& json_retval);
+  virtual void OnDialogClosed(const std::string& json_retval) OVERRIDE;
 
-  virtual void OnCloseContents(TabContents* source, bool* out_close_dialog) {}
+  virtual void OnCloseContents(TabContents* source,
+                               bool* out_close_dialog) OVERRIDE {}
 
-  virtual bool ShouldShowDialogTitle() const {
+  virtual bool ShouldShowDialogTitle() const OVERRIDE {
     return true;
   }
 
   // WebUIMessageHandler method:
-  virtual void RegisterMessages() {
+  virtual void RegisterMessages() OVERRIDE {
     web_ui_->RegisterMessageCallback(
         "GetAutofill",
         NewCallback(this, &LoginHandlerHtmlDelegate::GetAutofill));
diff --git a/chrome/browser/ui/views/select_file_dialog.cc b/chrome/browser/ui/views/select_file_dialog.cc
index 907832c..905ac2f 100644
--- a/chrome/browser/ui/views/select_file_dialog.cc
+++ b/chrome/browser/ui/views/select_file_dialog.cc
@@ -124,7 +124,7 @@ class SelectFileDialogImpl : public SelectFileDialog {
     explicit FileBrowseDelegateHandler(FileBrowseDelegate* delegate);
 
     // WebUIMessageHandler implementation.
-    virtual void RegisterMessages();
+    virtual void RegisterMessages() OVERRIDE;
 
     // Callback for the "setDialogTitle" message.
     void HandleSetDialogTitle(const ListValue* args);
diff --git a/chrome/browser/ui/webui/active_downloads_ui.cc b/chrome/browser/ui/webui/active_downloads_ui.cc
index 59a6db7..a6faa09 100644
--- a/chrome/browser/ui/webui/active_downloads_ui.cc
+++ b/chrome/browser/ui/webui/active_downloads_ui.cc
@@ -156,15 +156,15 @@ class ActiveDownloadsHandler
   void Init();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // DownloadItem::Observer interface.
-  virtual void OnDownloadUpdated(DownloadItem* item);
-  virtual void OnDownloadOpened(DownloadItem* item) { }
+  virtual void OnDownloadUpdated(DownloadItem* item) OVERRIDE;
+  virtual void OnDownloadOpened(DownloadItem* item) OVERRIDE { }
 
   // DownloadManager::Observer interface.
-  virtual void ModelChanged();
+  virtual void ModelChanged() OVERRIDE;
 
   // WebUI Callbacks.
   void HandleGetDownloads(const ListValue* args);
diff --git a/chrome/browser/ui/webui/bookmarks_ui.h b/chrome/browser/ui/webui/bookmarks_ui.h
index a871e5e5..b7295aa 100644
--- a/chrome/browser/ui/webui/bookmarks_ui.h
+++ b/chrome/browser/ui/webui/bookmarks_ui.h
@@ -23,8 +23,8 @@ class BookmarksUIHTMLSource : public ChromeURLDataManager::DataSource {
   // the path we registered.
   virtual void StartDataRequest(const std::string& path,
                                 bool is_incognito,
-                                int request_id);
-  virtual std::string GetMimeType(const std::string& path) const;
+                                int request_id) OVERRIDE;
+  virtual std::string GetMimeType(const std::string& path) const OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BookmarksUIHTMLSource);
diff --git a/chrome/browser/ui/webui/bug_report_ui.cc b/chrome/browser/ui/webui/bug_report_ui.cc
index c29af14..2e90b31 100644
--- a/chrome/browser/ui/webui/bug_report_ui.cc
+++ b/chrome/browser/ui/webui/bug_report_ui.cc
@@ -197,8 +197,8 @@ class BugReportHandler : public WebUIMessageHandler,
   base::StringPiece Init();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
  private:
   void HandleGetDialogDefaults(const ListValue* args);
diff --git a/chrome/browser/ui/webui/chromeos/choose_mobile_network_ui.cc b/chrome/browser/ui/webui/chromeos/choose_mobile_network_ui.cc
index 4f98584..243221d 100644
--- a/chrome/browser/ui/webui/chromeos/choose_mobile_network_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/choose_mobile_network_ui.cc
@@ -70,11 +70,11 @@ class ChooseMobileNetworkHandler
   virtual ~ChooseMobileNetworkHandler();
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // NetworkDeviceObserver implementation.
-  virtual void OnNetworkDeviceFoundNetworks(NetworkLibrary* cros,
-                                            const NetworkDevice* device);
+  virtual void OnNetworkDeviceFoundNetworks(
+      NetworkLibrary* cros, const NetworkDevice* device) OVERRIDE;
 
  private:
   // Handlers for JS WebUI messages.
diff --git a/chrome/browser/ui/webui/chromeos/keyboard_overlay_ui.cc b/chrome/browser/ui/webui/chromeos/keyboard_overlay_ui.cc
index f94ca8d..51000d2 100644
--- a/chrome/browser/ui/webui/chromeos/keyboard_overlay_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/keyboard_overlay_ui.cc
@@ -207,8 +207,8 @@ class KeyboardOverlayHandler
   virtual ~KeyboardOverlayHandler();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
  private:
   // Called when the page requires the input method ID corresponding to the
diff --git a/chrome/browser/ui/webui/chromeos/login/oobe_ui.h b/chrome/browser/ui/webui/chromeos/login/oobe_ui.h
index 2f9a96f..7a5132d 100644
--- a/chrome/browser/ui/webui/chromeos/login/oobe_ui.h
+++ b/chrome/browser/ui/webui/chromeos/login/oobe_ui.h
@@ -31,15 +31,16 @@ class OobeUI : public OobeDisplay,
   explicit OobeUI(TabContents* contents);
 
   // OobeDisplay implementation:
-  virtual void ShowScreen(WizardScreen* screen);
-  virtual void HideScreen(WizardScreen* screen);
-  virtual UpdateScreenActor* GetUpdateScreenActor();
-  virtual NetworkScreenActor* GetNetworkScreenActor();
-  virtual EulaScreenActor* GetEulaScreenActor();
-  virtual EnterpriseEnrollmentScreenActor* GetEnterpriseEnrollmentScreenActor();
-  virtual UserImageScreenActor* GetUserImageScreenActor();
-  virtual ViewScreenDelegate* GetRegistrationScreenActor();
-  virtual ViewScreenDelegate* GetHTMLPageScreenActor();
+  virtual void ShowScreen(WizardScreen* screen) OVERRIDE;
+  virtual void HideScreen(WizardScreen* screen) OVERRIDE;
+  virtual UpdateScreenActor* GetUpdateScreenActor() OVERRIDE;
+  virtual NetworkScreenActor* GetNetworkScreenActor() OVERRIDE;
+  virtual EulaScreenActor* GetEulaScreenActor() OVERRIDE;
+  virtual EnterpriseEnrollmentScreenActor* GetEnterpriseEnrollmentScreenActor()
+      OVERRIDE;
+  virtual UserImageScreenActor* GetUserImageScreenActor() OVERRIDE;
+  virtual ViewScreenDelegate* GetRegistrationScreenActor() OVERRIDE;
+  virtual ViewScreenDelegate* GetHTMLPageScreenActor() OVERRIDE;
 
   // Collects localized strings from the owned handlers.
   void GetLocalizedStrings(base::DictionaryValue* localized_strings);
diff --git a/chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc b/chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc
index 30b8bef..9bde86e 100644
--- a/chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc
@@ -165,14 +165,14 @@ class MobileSetupHandler
   void Init(TabContents* contents);
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // NetworkLibrary::NetworkManagerObserver implementation.
-  virtual void OnNetworkManagerChanged(chromeos::NetworkLibrary* obj);
+  virtual void OnNetworkManagerChanged(chromeos::NetworkLibrary* obj) OVERRIDE;
   // NetworkLibrary::NetworkObserver implementation.
   virtual void OnNetworkChanged(chromeos::NetworkLibrary* obj,
-                                const chromeos::Network* network);
+                                const chromeos::Network* network) OVERRIDE;
 
  private:
   typedef enum PlanActivationState {
diff --git a/chrome/browser/ui/webui/chromeos/register_page_ui.cc b/chrome/browser/ui/webui/chromeos/register_page_ui.cc
index 5e1a439..14480c8 100644
--- a/chrome/browser/ui/webui/chromeos/register_page_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/register_page_ui.cc
@@ -118,8 +118,8 @@ class RegisterPageHandler : public WebUIMessageHandler,
   void Init();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
  private:
   // Handlers for JS WebUI messages.
diff --git a/chrome/browser/ui/webui/chromeos/sim_unlock_ui.cc b/chrome/browser/ui/webui/chromeos/sim_unlock_ui.cc
index 0dfd028..7cea5a8 100644
--- a/chrome/browser/ui/webui/chromeos/sim_unlock_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/sim_unlock_ui.cc
@@ -93,16 +93,16 @@ class SimUnlockHandler : public WebUIMessageHandler,
   void Init(TabContents* contents);
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // NetworkLibrary::NetworkDeviceObserver implementation.
   virtual void OnNetworkDeviceChanged(NetworkLibrary* cros,
-                                      const NetworkDevice* device);
+                                      const NetworkDevice* device) OVERRIDE;
 
   // NetworkLibrary::PinOperationObserver implementation.
   virtual void OnPinOperationCompleted(NetworkLibrary* cros,
-                                       PinOperationError error);
+                                       PinOperationError error) OVERRIDE;
 
  private:
   // Should keep this state enum in sync with similar one in JS code.
diff --git a/chrome/browser/ui/webui/chromeos/system_info_ui.cc b/chrome/browser/ui/webui/chromeos/system_info_ui.cc
index 4128e5f..872e987 100644
--- a/chrome/browser/ui/webui/chromeos/system_info_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/system_info_ui.cc
@@ -68,8 +68,8 @@ class SystemInfoHandler : public WebUIMessageHandler,
   virtual ~SystemInfoHandler();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SystemInfoHandler);
diff --git a/chrome/browser/ui/webui/constrained_html_ui.h b/chrome/browser/ui/webui/constrained_html_ui.h
index 58c2058..3141f50 100644
--- a/chrome/browser/ui/webui/constrained_html_ui.h
+++ b/chrome/browser/ui/webui/constrained_html_ui.h
@@ -36,7 +36,7 @@ class ConstrainedHtmlUI : public ChromeWebUI {
   explicit ConstrainedHtmlUI(TabContents* contents);
   virtual ~ConstrainedHtmlUI();
 
-  virtual void RenderViewCreated(RenderViewHost* render_view_host);
+  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
 
   // Create a constrained HTML dialog. The actual object that gets created
   // is a ConstrainedHtmlUIDelegate, which later triggers construction of a
diff --git a/chrome/browser/ui/webui/crashes_ui.cc b/chrome/browser/ui/webui/crashes_ui.cc
index 5bb00a8..f148828 100644
--- a/chrome/browser/ui/webui/crashes_ui.cc
+++ b/chrome/browser/ui/webui/crashes_ui.cc
@@ -68,11 +68,11 @@ class CrashesDOMHandler : public WebUIMessageHandler,
   virtual ~CrashesDOMHandler();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // CrashUploadList::Delegate implemenation.
-  virtual void OnCrashListAvailable();
+  virtual void OnCrashListAvailable() OVERRIDE;
 
  private:
   // Asynchronously fetches the list of crashes. Called from JS.
diff --git a/chrome/browser/ui/webui/devtools_ui.h b/chrome/browser/ui/webui/devtools_ui.h
index 0bfa46a..4cd07b8 100644
--- a/chrome/browser/ui/webui/devtools_ui.h
+++ b/chrome/browser/ui/webui/devtools_ui.h
@@ -17,7 +17,7 @@ class DevToolsUI : public ChromeWebUI {
   explicit DevToolsUI(TabContents* contents);
 
   // WebUI
-  virtual void RenderViewCreated(RenderViewHost* render_view_host);
+  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DevToolsUI);
diff --git a/chrome/browser/ui/webui/downloads_dom_handler.h b/chrome/browser/ui/webui/downloads_dom_handler.h
index d407b66..2045eef 100644
--- a/chrome/browser/ui/webui/downloads_dom_handler.h
+++ b/chrome/browser/ui/webui/downloads_dom_handler.h
@@ -29,14 +29,14 @@ class DownloadsDOMHandler : public WebUIMessageHandler,
   void Init();
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // DownloadItem::Observer interface
-  virtual void OnDownloadUpdated(DownloadItem* download);
-  virtual void OnDownloadOpened(DownloadItem* download) { }
+  virtual void OnDownloadUpdated(DownloadItem* download) OVERRIDE;
+  virtual void OnDownloadOpened(DownloadItem* download) OVERRIDE { }
 
   // DownloadManager::Observer interface
-  virtual void ModelChanged();
+  virtual void ModelChanged() OVERRIDE;
 
   // Callback for the "getDownloads" message.
   void HandleGetDownloads(const base::ListValue* args);
diff --git a/chrome/browser/ui/webui/flags_ui.cc b/chrome/browser/ui/webui/flags_ui.cc
index b9ed86a..acdd1aa 100644
--- a/chrome/browser/ui/webui/flags_ui.cc
+++ b/chrome/browser/ui/webui/flags_ui.cc
@@ -87,7 +87,7 @@ class FlagsDOMHandler : public WebUIMessageHandler {
   virtual ~FlagsDOMHandler() {}
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for the "requestFlagsExperiments" message.
   void HandleRequestFlagsExperiments(const ListValue* args);
diff --git a/chrome/browser/ui/webui/gpu_internals_ui.cc b/chrome/browser/ui/webui/gpu_internals_ui.cc
index a6c8d79..8088c55 100644
--- a/chrome/browser/ui/webui/gpu_internals_ui.cc
+++ b/chrome/browser/ui/webui/gpu_internals_ui.cc
@@ -73,10 +73,10 @@ class GpuMessageHandler
   virtual ~GpuMessageHandler();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
-  // Mesages
+  // Messages
   void OnBeginTracing(const ListValue* list);
   void OnEndTracingAsync(const ListValue* list);
   void OnBrowserBridgeInitialized(const ListValue* list);
@@ -90,8 +90,10 @@ class GpuMessageHandler
   Value* OnRequestLogMessages(const ListValue* list);
 
   // SelectFileDialog::Listener implementation
-  virtual void FileSelected(const FilePath& path, int index, void* params);
-  virtual void FileSelectionCanceled(void* params);
+  virtual void FileSelected(const FilePath& path,
+                            int index,
+                            void* params) OVERRIDE;
+  virtual void FileSelectionCanceled(void* params) OVERRIDE;
 
   // Callbacks.
   void OnGpuInfoUpdate();
@@ -99,9 +101,9 @@ class GpuMessageHandler
   void SaveTraceFileComplete();
 
   // TraceSubscriber implementation.
-  virtual void OnEndTracingComplete();
-  virtual void OnTraceDataCollected(const std::string& json_events);
-  virtual void OnTraceBufferPercentFullReply(float percent_full);
+  virtual void OnEndTracingComplete() OVERRIDE;
+  virtual void OnTraceDataCollected(const std::string& json_events) OVERRIDE;
+  virtual void OnTraceBufferPercentFullReply(float percent_full) OVERRIDE;
 
   // Executes the javascript function |function_name| in the renderer, passing
   // it the argument |value|.
diff --git a/chrome/browser/ui/webui/history2_ui.h b/chrome/browser/ui/webui/history2_ui.h
index cdc8c26..ca2fa55 100644
--- a/chrome/browser/ui/webui/history2_ui.h
+++ b/chrome/browser/ui/webui/history2_ui.h
@@ -46,8 +46,8 @@ class BrowsingHistoryHandler2 : public WebUIMessageHandler,
   virtual ~BrowsingHistoryHandler2();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for the "getHistory" message.
   void HandleGetHistory(const base::ListValue* args);
@@ -64,7 +64,7 @@ class BrowsingHistoryHandler2 : public WebUIMessageHandler,
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
  private:
   // Callback from the history system when the history list is available.
diff --git a/chrome/browser/ui/webui/history_ui.cc b/chrome/browser/ui/webui/history_ui.cc
index 9fa45b7..4019b18 100644
--- a/chrome/browser/ui/webui/history_ui.cc
+++ b/chrome/browser/ui/webui/history_ui.cc
@@ -63,9 +63,9 @@ class HistoryUIHTMLSource : public ChromeWebUIDataSource {
   // the path we registered.
   virtual void StartDataRequest(const std::string& path,
                                 bool is_incognito,
-                                int request_id);
+                                int request_id) OVERRIDE;
 
-  virtual std::string GetMimeType(const std::string& path) const;
+  virtual std::string GetMimeType(const std::string& path) const OVERRIDE;
 
  private:
   ~HistoryUIHTMLSource();
diff --git a/chrome/browser/ui/webui/history_ui.h b/chrome/browser/ui/webui/history_ui.h
index 4f8197f..fd36429 100644
--- a/chrome/browser/ui/webui/history_ui.h
+++ b/chrome/browser/ui/webui/history_ui.h
@@ -25,8 +25,8 @@ class BrowsingHistoryHandler : public WebUIMessageHandler,
   virtual ~BrowsingHistoryHandler();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for the "getHistory" message.
   void HandleGetHistory(const base::ListValue* args);
@@ -43,7 +43,7 @@ class BrowsingHistoryHandler : public WebUIMessageHandler,
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
  private:
   // Callback from the history system when the history list is available.
diff --git a/chrome/browser/ui/webui/html_dialog_ui.h b/chrome/browser/ui/webui/html_dialog_ui.h
index eb34963..de3b52c 100644
--- a/chrome/browser/ui/webui/html_dialog_ui.h
+++ b/chrome/browser/ui/webui/html_dialog_ui.h
@@ -107,7 +107,7 @@ class HtmlDialogUI : public ChromeWebUI {
 
  private:
   // WebUI
-  virtual void RenderViewCreated(RenderViewHost* render_view_host);
+  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
 
   // JS message handler.
   void OnDialogClosed(const base::ListValue* args);
diff --git a/chrome/browser/ui/webui/keyboard_ui.h b/chrome/browser/ui/webui/keyboard_ui.h
index b2d42c8..18be90d 100644
--- a/chrome/browser/ui/webui/keyboard_ui.h
+++ b/chrome/browser/ui/webui/keyboard_ui.h
@@ -26,8 +26,8 @@ class KeyboardUI : public ChromeWebUI {
     // Overrides from DataSource
     virtual void StartDataRequest(const std::string& path,
                                   bool is_incognito,
-                                  int request_id);
-    virtual std::string GetMimeType(const std::string&) const;
+                                  int request_id) OVERRIDE;
+    virtual std::string GetMimeType(const std::string&) const OVERRIDE;
 
    private:
     virtual ~KeyboardHTMLSource() {}
diff --git a/chrome/browser/ui/webui/media/media_internals_handler.h b/chrome/browser/ui/webui/media/media_internals_handler.h
index c275766..e9bdb00 100644
--- a/chrome/browser/ui/webui/media/media_internals_handler.h
+++ b/chrome/browser/ui/webui/media/media_internals_handler.h
@@ -22,8 +22,8 @@ class MediaInternalsMessageHandler : public WebUIMessageHandler {
   virtual ~MediaInternalsMessageHandler();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // Javascript message handlers.
   void OnGetEverything(const base::ListValue* list);
diff --git a/chrome/browser/ui/webui/net_internals_ui.cc b/chrome/browser/ui/webui/net_internals_ui.cc
index 154343c..548b50c 100644
--- a/chrome/browser/ui/webui/net_internals_ui.cc
+++ b/chrome/browser/ui/webui/net_internals_ui.cc
@@ -160,8 +160,8 @@ class NetInternalsMessageHandler
   virtual ~NetInternalsMessageHandler();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // Calls g_browser.receive in the renderer, passing in |command| and |arg|.
   // Takes ownership of |arg|.  If the renderer is displaying a log file, the
@@ -171,7 +171,7 @@ class NetInternalsMessageHandler
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
   // Javascript message handlers.
   void OnRendererReady(const ListValue* list);
diff --git a/chrome/browser/ui/webui/new_profile_handler.h b/chrome/browser/ui/webui/new_profile_handler.h
index f4518c0..fc94ff9 100644
--- a/chrome/browser/ui/webui/new_profile_handler.h
+++ b/chrome/browser/ui/webui/new_profile_handler.h
@@ -20,7 +20,7 @@ class NewProfileHandler : public WebUIMessageHandler {
   NewProfileHandler();
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for the "create" message - finishes creating a profile.
   void HandleCreate(const base::ListValue* args);
diff --git a/chrome/browser/ui/webui/ntp/app_launcher_handler.h b/chrome/browser/ui/webui/ntp/app_launcher_handler.h
index 68ed8dc..7d6305c 100644
--- a/chrome/browser/ui/webui/ntp/app_launcher_handler.h
+++ b/chrome/browser/ui/webui/ntp/app_launcher_handler.h
@@ -50,13 +50,13 @@ class AppLauncherHandler : public WebUIMessageHandler,
   static bool HandlePing(Profile* profile, const std::string& path);
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // NotificationObserver
   virtual void Observe(int type,
                       const NotificationSource& source,
-                      const NotificationDetails& details);
+                      const NotificationDetails& details) OVERRIDE;
 
   // Populate the given dictionary with all installed app info.
   void FillAppDictionary(base::DictionaryValue* value);
@@ -125,12 +125,12 @@ class AppLauncherHandler : public WebUIMessageHandler,
   void PromptToEnableApp(const std::string& extension_id);
 
   // ExtensionUninstallDialog::Delegate:
-  virtual void ExtensionDialogAccepted();
-  virtual void ExtensionDialogCanceled();
+  virtual void ExtensionDialogAccepted() OVERRIDE;
+  virtual void ExtensionDialogCanceled() OVERRIDE;
 
   // ExtensionInstallUI::Delegate:
-  virtual void InstallUIProceed();
-  virtual void InstallUIAbort(bool user_initiated);
+  virtual void InstallUIProceed() OVERRIDE;
+  virtual void InstallUIAbort(bool user_initiated) OVERRIDE;
 
   // Returns the ExtensionUninstallDialog object for this class, creating it if
   // needed.
diff --git a/chrome/browser/ui/webui/ntp/bookmarks_handler.h b/chrome/browser/ui/webui/ntp/bookmarks_handler.h
index 6fa0128..91d5205 100644
--- a/chrome/browser/ui/webui/ntp/bookmarks_handler.h
+++ b/chrome/browser/ui/webui/ntp/bookmarks_handler.h
@@ -17,12 +17,12 @@ class BookmarksHandler : public WebUIMessageHandler,
   virtual ~BookmarksHandler();
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // NotificationObserver
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BookmarksHandler);
diff --git a/chrome/browser/ui/webui/ntp/favicon_webui_handler.h b/chrome/browser/ui/webui/ntp/favicon_webui_handler.h
index 30c40f0..08c906f 100644
--- a/chrome/browser/ui/webui/ntp/favicon_webui_handler.h
+++ b/chrome/browser/ui/webui/ntp/favicon_webui_handler.h
@@ -26,7 +26,7 @@ class FaviconWebUIHandler : public WebUIMessageHandler {
   virtual ~FaviconWebUIHandler();
 
   // WebUIMessageHandler
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   void HandleGetFaviconDominantColor(const base::ListValue* args);
 
diff --git a/chrome/browser/ui/webui/ntp/foreign_session_handler.h b/chrome/browser/ui/webui/ntp/foreign_session_handler.h
index 0bb190e..2846eae 100644
--- a/chrome/browser/ui/webui/ntp/foreign_session_handler.h
+++ b/chrome/browser/ui/webui/ntp/foreign_session_handler.h
@@ -32,7 +32,7 @@ class ForeignSessionHandler : public WebUIMessageHandler,
   // Determines how ForeignSessionHandler will interact with the new tab page.
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
   // Returns a pointer to the current session model associator or NULL.
   SessionModelAssociator* GetModelAssociator();
diff --git a/chrome/browser/ui/webui/ntp/most_visited_handler.h b/chrome/browser/ui/webui/ntp/most_visited_handler.h
index adc8afb..dfef887 100644
--- a/chrome/browser/ui/webui/ntp/most_visited_handler.h
+++ b/chrome/browser/ui/webui/ntp/most_visited_handler.h
@@ -42,8 +42,8 @@ class MostVisitedHandler : public WebUIMessageHandler,
   virtual ~MostVisitedHandler();
 
   // WebUIMessageHandler override and implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for the "getMostVisited" message.
   void HandleGetMostVisited(const base::ListValue* args);
@@ -66,7 +66,7 @@ class MostVisitedHandler : public WebUIMessageHandler,
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
   const std::vector<GURL>& most_visited_urls() const {
     return most_visited_urls_;
diff --git a/chrome/browser/ui/webui/ntp/new_tab_page_handler.h b/chrome/browser/ui/webui/ntp/new_tab_page_handler.h
index ba2566a..9cfa1588 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_page_handler.h
+++ b/chrome/browser/ui/webui/ntp/new_tab_page_handler.h
@@ -19,7 +19,7 @@ class NewTabPageHandler : public WebUIMessageHandler {
   virtual ~NewTabPageHandler() {}
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for "closePromo".
   void HandleClosePromo(const ListValue* args);
diff --git a/chrome/browser/ui/webui/ntp/new_tab_page_sync_handler.h b/chrome/browser/ui/webui/ntp/new_tab_page_sync_handler.h
index 2edc464..9ebb02f 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_page_sync_handler.h
+++ b/chrome/browser/ui/webui/ntp/new_tab_page_sync_handler.h
@@ -25,8 +25,8 @@ class NewTabPageSyncHandler : public WebUIMessageHandler,
   virtual ~NewTabPageSyncHandler();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for "GetSyncMessage".
   void HandleGetSyncMessage(const base::ListValue* args);
@@ -34,7 +34,7 @@ class NewTabPageSyncHandler : public WebUIMessageHandler,
   void HandleSyncLinkClicked(const base::ListValue* args);
 
   // ProfileSyncServiceObserver
-  virtual void OnStateChanged();
+  virtual void OnStateChanged() OVERRIDE;
 
  private:
   enum MessageType {
diff --git a/chrome/browser/ui/webui/ntp/new_tab_ui.cc b/chrome/browser/ui/webui/ntp/new_tab_ui.cc
index 4bd36ac..bd1e852 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_ui.cc
+++ b/chrome/browser/ui/webui/ntp/new_tab_ui.cc
@@ -85,7 +85,7 @@ class MetricsHandler : public WebUIMessageHandler {
   virtual ~MetricsHandler() {}
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback which records a user action.
   void HandleRecordAction(const ListValue* args);
diff --git a/chrome/browser/ui/webui/ntp/new_tab_ui.h b/chrome/browser/ui/webui/ntp/new_tab_ui.h
index 670f206..af1cc47 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_ui.h
+++ b/chrome/browser/ui/webui/ntp/new_tab_ui.h
@@ -30,8 +30,8 @@ class NewTabUI : public ChromeWebUI,
 
   // Override WebUI methods so we can hook up the paint timer to the render
   // view host.
-  virtual void RenderViewCreated(RenderViewHost* render_view_host);
-  virtual void RenderViewReused(RenderViewHost* render_view_host);
+  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
+  virtual void RenderViewReused(RenderViewHost* render_view_host) OVERRIDE;
 
   static void RegisterUserPrefs(PrefService* prefs);
   static void MigrateUserPrefs(PrefService* prefs, int old_pref_version,
@@ -58,9 +58,9 @@ class NewTabUI : public ChromeWebUI,
     // the path we registered.
     virtual void StartDataRequest(const std::string& path,
                                   bool is_incognito,
-                                  int request_id);
+                                  int request_id) OVERRIDE;
 
-    virtual std::string GetMimeType(const std::string&) const;
+    virtual std::string GetMimeType(const std::string&) const OVERRIDE;
 
     virtual bool ShouldReplaceExistingSource() const;
 
diff --git a/chrome/browser/ui/webui/ntp/ntp_login_handler.h b/chrome/browser/ui/webui/ntp/ntp_login_handler.h
index 5811f40..ba8695f 100644
--- a/chrome/browser/ui/webui/ntp/ntp_login_handler.h
+++ b/chrome/browser/ui/webui/ntp/ntp_login_handler.h
@@ -19,15 +19,15 @@ class NTPLoginHandler : public WebUIMessageHandler,
   NTPLoginHandler();
   virtual ~NTPLoginHandler();
 
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
 
   // WebUIMessageHandler interface
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // NotificationObserver interface
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
  private:
   // Called from JS when the NTP is loaded.
diff --git a/chrome/browser/ui/webui/ntp/recently_closed_tabs_handler.h b/chrome/browser/ui/webui/ntp/recently_closed_tabs_handler.h
index 00e2777..3fe981a 100644
--- a/chrome/browser/ui/webui/ntp/recently_closed_tabs_handler.h
+++ b/chrome/browser/ui/webui/ntp/recently_closed_tabs_handler.h
@@ -19,7 +19,7 @@ class RecentlyClosedTabsHandler : public WebUIMessageHandler,
   virtual ~RecentlyClosedTabsHandler();
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for the "reopenTab" message. Rewrites the history of the
   // currently displayed tab to be the one in TabRestoreService with a
@@ -32,11 +32,11 @@ class RecentlyClosedTabsHandler : public WebUIMessageHandler,
   // Observer callback for TabRestoreServiceObserver. Sends data on
   // recently closed tabs to the javascript side of this page to
   // display to the user.
-  virtual void TabRestoreServiceChanged(TabRestoreService* service);
+  virtual void TabRestoreServiceChanged(TabRestoreService* service) OVERRIDE;
 
   // Observer callback to notice when our associated TabRestoreService
   // is destroyed.
-  virtual void TabRestoreServiceDestroyed(TabRestoreService* service);
+  virtual void TabRestoreServiceDestroyed(TabRestoreService* service) OVERRIDE;
 
   // Converts a list of TabRestoreService entries to the JSON format required
   // by the NTP and adds them to the given list value.
diff --git a/chrome/browser/ui/webui/ntp/shown_sections_handler.h b/chrome/browser/ui/webui/ntp/shown_sections_handler.h
index e7a957e..af99c1f 100644
--- a/chrome/browser/ui/webui/ntp/shown_sections_handler.h
+++ b/chrome/browser/ui/webui/ntp/shown_sections_handler.h
@@ -50,12 +50,12 @@ class ShownSectionsHandler : public WebUIMessageHandler,
   static void SetShownSection(PrefService* prefs, Section section);
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
   // Callback for "setShownSections" message.
   void HandleSetShownSections(const base::ListValue* args);
diff --git a/chrome/browser/ui/webui/options/options_ui.h b/chrome/browser/ui/webui/options/options_ui.h
index d4a27f8..53b0ec3 100644
--- a/chrome/browser/ui/webui/options/options_ui.h
+++ b/chrome/browser/ui/webui/options/options_ui.h
@@ -41,12 +41,12 @@ class OptionsPageUIHandler : public WebUIMessageHandler,
   virtual void Uninitialize() {}
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() {}
+  virtual void RegisterMessages() OVERRIDE {}
 
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details) {}
+                       const NotificationDetails& details) OVERRIDE {}
 
   void UserMetricsRecordAction(const UserMetricsAction& action);
 
diff --git a/chrome/browser/ui/webui/plugins_ui.cc b/chrome/browser/ui/webui/plugins_ui.cc
index f97e82b..d7ab1b0 100644
--- a/chrome/browser/ui/webui/plugins_ui.cc
+++ b/chrome/browser/ui/webui/plugins_ui.cc
@@ -101,8 +101,8 @@ class PluginsDOMHandler : public WebUIMessageHandler,
   virtual ~PluginsDOMHandler() {}
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for the "requestPluginsData" message.
   void HandleRequestPluginsData(const ListValue* args);
@@ -117,9 +117,9 @@ class PluginsDOMHandler : public WebUIMessageHandler,
   void HandleGetShowDetails(const ListValue* args);
 
   // NotificationObserver method overrides
-  void Observe(int type,
-               const NotificationSource& source,
-               const NotificationDetails& details);
+  virtual void Observe(int type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details) OVERRIDE;
 
  private:
   // This extra wrapper is used to ensure we don't leak the ListValue* pointer
diff --git a/chrome/browser/ui/webui/print_preview_handler.h b/chrome/browser/ui/webui/print_preview_handler.h
index 779b460..1a354e4 100644
--- a/chrome/browser/ui/webui/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview_handler.h
@@ -36,14 +36,16 @@ class PrintPreviewHandler : public WebUIMessageHandler,
   virtual ~PrintPreviewHandler();
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // SelectFileDialog::Listener implementation.
-  virtual void FileSelected(const FilePath& path, int index, void* params);
-  virtual void FileSelectionCanceled(void* params);
+  virtual void FileSelected(const FilePath& path,
+                            int index,
+                            void* params) OVERRIDE;
+  virtual void FileSelectionCanceled(void* params) OVERRIDE;
 
   // PrintViewManagerObserver implementation.
-  virtual void OnPrintDialogShown();
+  virtual void OnPrintDialogShown() OVERRIDE;
 
   // Displays a modal dialog, prompting the user to select a file.
   void SelectFile(const FilePath& default_path);
diff --git a/chrome/browser/ui/webui/quota_internals_ui.h b/chrome/browser/ui/webui/quota_internals_ui.h
index d954fdb..d805b2b 100644
--- a/chrome/browser/ui/webui/quota_internals_ui.h
+++ b/chrome/browser/ui/webui/quota_internals_ui.h
@@ -29,7 +29,7 @@ class QuotaInternalsHTMLSource : public ChromeWebUIDataSource {
   virtual void StartDataRequest(const std::string& path,
                                 bool is_incognito,
                                 int request_id) OVERRIDE;
-  virtual std::string GetMimeType(const std::string& path) const;
+  virtual std::string GetMimeType(const std::string& path) const OVERRIDE;
 
  private:
   virtual ~QuotaInternalsHTMLSource() {}
diff --git a/chrome/browser/ui/webui/sessions_ui.cc b/chrome/browser/ui/webui/sessions_ui.cc
index 7d78573..e9e0e0c 100644
--- a/chrome/browser/ui/webui/sessions_ui.cc
+++ b/chrome/browser/ui/webui/sessions_ui.cc
@@ -62,8 +62,8 @@ class SessionsDOMHandler : public WebUIMessageHandler {
   virtual ~SessionsDOMHandler();
 
   // WebUIMessageHandler implementation.
-  virtual WebUIMessageHandler* Attach(WebUI* web_ui);
-  virtual void RegisterMessages();
+  virtual WebUIMessageHandler* Attach(WebUI* web_ui) OVERRIDE;
+  virtual void RegisterMessages() OVERRIDE;
 
  private:
   // Asynchronously fetches the session list. Called from JS.
diff --git a/chrome/browser/ui/webui/textfields_ui.h b/chrome/browser/ui/webui/textfields_ui.h
index d00ae2b..4d56093 100644
--- a/chrome/browser/ui/webui/textfields_ui.h
+++ b/chrome/browser/ui/webui/textfields_ui.h
@@ -49,7 +49,7 @@ class TextfieldsDOMHandler : public WebUIMessageHandler {
   virtual void HandleTextfieldValue(const base::ListValue* args);
 
  protected:
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TextfieldsDOMHandler);
diff --git a/chrome/browser/ui/webui/web_ui_test_handler.h b/chrome/browser/ui/webui/web_ui_test_handler.h
index 185e69b..b5b2251f 100644
--- a/chrome/browser/ui/webui/web_ui_test_handler.h
+++ b/chrome/browser/ui/webui/web_ui_test_handler.h
@@ -21,7 +21,7 @@ class WebUITestHandler : public WebUIMessageHandler,
  private:
   // WebUIMessageHandler overrides.
   // Add test handlers to the current WebUI object.
-  virtual void RegisterMessages() {}
+  virtual void RegisterMessages() OVERRIDE {}
 
   // From NotificationObserver.
   virtual void Observe(int type,
diff --git a/chrome/browser/ui/webui/workers_ui.cc b/chrome/browser/ui/webui/workers_ui.cc
index 3c538eb..a471422 100644
--- a/chrome/browser/ui/webui/workers_ui.cc
+++ b/chrome/browser/ui/webui/workers_ui.cc
@@ -111,7 +111,7 @@ class WorkersDOMHandler : public WebUIMessageHandler {
 
  private:
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages();
+  virtual void RegisterMessages() OVERRIDE;
 
   // Callback for "openDevTools" message.
   void HandleOpenDevTools(const ListValue* args);