Revert of Add a new status area control for Overview Mode. This control is only available (https://codereview.chromium.org/180743016/)

Reason for revert:
Somewhat speculative revert. This CL is one of two Ash-related CLs in the range where HideTooltipWhenCursorHidden in ash_unittests started failing:
http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%282%29/builds/28144/steps/ash_unittests/logs/HideTooltipWhenCursorHidden

This looked most likely to be related to the failure to my untrained eye.

Original issue's description:
> Add a new status area control for Overview Mode. This control is only available while Maximize Mode is active.
> 
> BUG=337590
> TEST=OverviewModeTrayTest.*
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=256420

TBR=flackr@chromium.org,skuhne@chromium.org,oshima@chromium.org,sadrul@chromium.org,jonross@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=337590

Review URL: https://codereview.chromium.org/196603007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256535 0039d316-1c4b-4281-b951-d872f2087c98

12 files changed, 10 insertions, 345 deletions

diff --git a/ash/ash.gyp b/ash/ash.gyp
index 40179da..f9a221d 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -367,8 +367,6 @@
         'system/keyboard_brightness/keyboard_brightness_control_delegate.h',
         'system/locale/locale_notification_controller.cc',
         'system/locale/locale_notification_controller.h',
-        'system/overview/overview_button_tray.h',
-        'system/overview/overview_button_tray.cc',
         'system/session/logout_button_observer.h',
         'system/session/logout_button_tray.cc',
         'system/session/logout_button_tray.h',
@@ -925,7 +923,6 @@
         'system/chromeos/tray_display_unittest.cc',
         'system/date/date_view_unittest.cc',
         'system/session/logout_confirmation_controller_unittest.cc',
-        'system/overview/overview_button_tray_unittest.cc',
         'system/session/tray_session_length_limit_unittest.cc',
         'system/tray/system_tray_unittest.cc',
         'system/tray/tray_details_view_unittest.cc',
diff --git a/ash/ash_strings.grd b/ash/ash_strings.grd
index e0531e4..3bd706bc 100644
--- a/ash/ash_strings.grd
+++ b/ash/ash_strings.grd
@@ -624,11 +624,6 @@ Press Shift + Alt to switch.
         search
       </message>
 
-      <!-- Overview Mode -->
-      <message name="IDS_ASH_OVERVIEW_BUTTON_ACCESSIBLE_NAME" desc="The accessible name for the Overview button in the system tray.">
-        Toggle window overview
-      </message>
-
       <!-- ChromeOS-specific strings -->
       <if expr="chromeos">
         <part file="ash_chromeos_strings.grdp" />
diff --git a/ash/resources/ash_resources.grd b/ash/resources/ash_resources.grd
index 4111872..a650f4f0 100644
--- a/ash/resources/ash_resources.grd
+++ b/ash/resources/ash_resources.grd
@@ -163,7 +163,6 @@
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_NETWORK_INFO_HOVER" file="cros/network/status_network_info_hover.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_NOTIFICATION_3G" file="cros/network/notification_3g.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_NOTIFICATION_LTE" file="cros/network/notification_lte.png" />
-      <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_OVERVIEW_MODE" file="cros/status/status_overview_mode.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_POWER_SMALL" file="cros/status/status_power_small_all.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_POWER_SMALL_DARK" file="cros/status/status_power_small_all_dark.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_POWER_SMALL_CHARGING_UNRELIABLE" file="cros/status/status_power_small_all_fluctuating.png" />
diff --git a/ash/shell.cc b/ash/shell.cc
index 9dde5c4..08ae512 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -389,14 +389,6 @@ void Shell::OnOverviewModeEnding() {
   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeEnding());
 }
 
-void Shell::OnMaximizeModeStarted() {
-  FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeStarted());
-}
-
-void Shell::OnMaximizeModeEnded() {
-  FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeEnded());
-}
-
 void Shell::CreateShelf() {
   RootWindowControllerList controllers = GetAllRootWindowControllers();
   for (RootWindowControllerList::iterator iter = controllers.begin();
diff --git a/ash/shell.h b/ash/shell.h
index 4b0df83..49fbda9 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -299,13 +299,6 @@ class ASH_EXPORT Shell
   // to their final position).
   void OnOverviewModeEnding();
 
-  // Called after maximize mode has started, windows might still animate though.
-  void OnMaximizeModeStarted();
-
-  // Called after maximize mode has ended, windows might still be returning to
-  // their original position.
-  void OnMaximizeModeEnded();
-
   // Initializes |shelf_|.  Does nothing if it's already initialized.
   void CreateShelf();
 
diff --git a/ash/shell_observer.h b/ash/shell_observer.h
index d1b3d86..c2b652c 100644
--- a/ash/shell_observer.h
+++ b/ash/shell_observer.h
@@ -47,14 +47,6 @@ class ASH_EXPORT ShellObserver {
   // to their final position).
   virtual void OnOverviewModeEnding() {}
 
-  // Called when the always maximize mode has started. Windows might still
-  // animate though.
-  virtual void OnMaximizeModeStarted() {}
-
-  // Called when the always maximize mode has ended. Windows may still be
-  // animating but have been restored.
-  virtual void OnMaximizeModeEnded() {}
-
  protected:
   virtual ~ShellObserver() {}
 };
diff --git a/ash/system/overview/overview_button_tray.cc b/ash/system/overview/overview_button_tray.cc
deleted file mode 100644
index 4ca4166..0000000
--- a/ash/system/overview/overview_button_tray.cc
+++ /dev/null
@@ -1,106 +0,0 @@
-// Copyright 2014 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 "ash/system/overview/overview_button_tray.h"
-
-#include "ash/shelf/shelf_types.h"
-#include "ash/shell.h"
-#include "ash/system/tray/tray_utils.h"
-#include "ash/wm/overview/window_selector_controller.h"
-#include "grit/ash_resources.h"
-#include "grit/ash_strings.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/base/resource/resource_bundle.h"
-#include "ui/views/border.h"
-#include "ui/views/controls/image_view.h"
-
-namespace {
-
-// Predefined padding for the icon used in this tray. These are to be set to the
-// border of the icon, depending on the current shelf_alignment()
-const int kHorizontalShelfHorizontalPadding = 8;
-const int kHorizontalShelfVerticalPadding = 4;
-const int kVerticalShelfHorizontalPadding = 2;
-const int kVerticalShelfVerticalPadding = 5;
-
-}  // namespace
-
-namespace ash {
-
-OverviewButtonTray::OverviewButtonTray(
-    internal::StatusAreaWidget* status_area_widget)
-    : TrayBackgroundView(status_area_widget),
-      icon_(NULL) {
-  SetContentsBackground();
-
-  ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
-  icon_ = new views::ImageView();
-  icon_->SetImage(
-      bundle.GetImageNamed(IDR_AURA_UBER_TRAY_OVERVIEW_MODE).ToImageSkia());
-  SetIconBorderForShelfAlignment();
-  tray_container()->AddChildView(icon_);
-
-  SetVisible(Shell::GetInstance()->IsMaximizeModeWindowManagerEnabled());
-
-  Shell::GetInstance()->AddShellObserver(this);
-}
-
-OverviewButtonTray::~OverviewButtonTray() {
-  Shell::GetInstance()->RemoveShellObserver(this);
-}
-
-bool OverviewButtonTray::PerformAction(const ui::Event& event) {
-  Shell::GetInstance()->window_selector_controller()->ToggleOverview();
-  return true;
-}
-
-void OverviewButtonTray::OnMaximizeModeStarted() {
-  SetVisible(true);
-}
-
-void OverviewButtonTray::OnMaximizeModeEnded() {
-  SetVisible(false);
-}
-
-bool OverviewButtonTray::ClickedOutsideBubble() {
-  // This class has no bubbles dismiss, but acknowledge that the message was
-  // handled.
-  return true;
-}
-
-base::string16 OverviewButtonTray::GetAccessibleNameForTray() {
-  return l10n_util::GetStringUTF16(IDS_ASH_OVERVIEW_BUTTON_ACCESSIBLE_NAME);
-}
-
-void OverviewButtonTray::HideBubbleWithView(
-    const views::TrayBubbleView* bubble_view) {
-  // This class has no bubbles to hide.
-}
-
-void OverviewButtonTray::SetShelfAlignment(ShelfAlignment alignment) {
-  if (alignment == shelf_alignment())
-    return;
-
-  TrayBackgroundView::SetShelfAlignment(alignment);
-  SetIconBorderForShelfAlignment();
-}
-
-void OverviewButtonTray::SetIconBorderForShelfAlignment() {
-  if (shelf_alignment() == SHELF_ALIGNMENT_BOTTOM ||
-      shelf_alignment() == SHELF_ALIGNMENT_TOP) {
-    icon_->SetBorder(views::Border::CreateEmptyBorder(
-        kHorizontalShelfVerticalPadding,
-        kHorizontalShelfHorizontalPadding,
-        kHorizontalShelfVerticalPadding,
-        kHorizontalShelfHorizontalPadding));
-  } else {
-    icon_->SetBorder(views::Border::CreateEmptyBorder(
-        kVerticalShelfVerticalPadding,
-        kVerticalShelfHorizontalPadding,
-        kVerticalShelfVerticalPadding,
-        kVerticalShelfHorizontalPadding));
-  }
-}
-
-}  // namespace ash
diff --git a/ash/system/overview/overview_button_tray.h b/ash/system/overview/overview_button_tray.h
deleted file mode 100644
index 0a16e47..0000000
--- a/ash/system/overview/overview_button_tray.h
+++ /dev/null
@@ -1,58 +0,0 @@
-// Copyright 2014 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 ASH_SYSTEM_OVERVIEW_OVERVIEW_BUTTON_TRAY_H_
-#define ASH_SYSTEM_OVERVIEW_OVERVIEW_BUTTON_TRAY_H_
-
-#include "ash/ash_export.h"
-#include "ash/shell_observer.h"
-#include "ash/system/tray/tray_background_view.h"
-
-namespace views {
-class ImageView;
-}
-
-namespace ash {
-
-// Status area tray for showing a toggle for Overview Mode. Overview Mode
-// is equivalent to WindowSelectorController being in selection mode.
-// This hosts a ShellObserver that listens for the activation of Maximize Mode
-// This tray will only be visible while in this state. This tray does not
-// provide any bubble view windows.
-class ASH_EXPORT OverviewButtonTray : public internal::TrayBackgroundView,
-                                      public ShellObserver {
- public:
-  explicit OverviewButtonTray(internal::StatusAreaWidget* status_area_widget);
-  virtual ~OverviewButtonTray();
-
-  // internal::ActionableView:
-  virtual bool PerformAction(const ui::Event& event) OVERRIDE;
-
-  // ShellObserver:
-  virtual void OnMaximizeModeStarted() OVERRIDE;
-  virtual void OnMaximizeModeEnded() OVERRIDE;
-
-  // internal::TrayBackgroundView:
-  virtual bool ClickedOutsideBubble() OVERRIDE;
-  virtual base::string16 GetAccessibleNameForTray() OVERRIDE;
-  virtual void HideBubbleWithView(
-      const views::TrayBubbleView* bubble_view) OVERRIDE;
-  virtual void SetShelfAlignment(ShelfAlignment alignment) OVERRIDE;
-
- private:
-  friend class OverviewButtonTrayTest;
-
-  // Creates a new border for the icon. The padding is determined based on the
-  // alignment of the shelf.
-  void SetIconBorderForShelfAlignment();
-
-  // Weak pointer, will be parented by TrayContainer for its lifetime.
-  views::ImageView* icon_;
-
-  DISALLOW_COPY_AND_ASSIGN(OverviewButtonTray);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_OVERVIEW_OVERVIEW_BUTTON_TRAY_H_
diff --git a/ash/system/overview/overview_button_tray_unittest.cc b/ash/system/overview/overview_button_tray_unittest.cc
deleted file mode 100644
index 201fd1d..0000000
--- a/ash/system/overview/overview_button_tray_unittest.cc
+++ /dev/null
@@ -1,121 +0,0 @@
-// Copyright 2014 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 "ash/system/overview/overview_button_tray.h"
-
-#include "ash/display/display_manager.h"
-#include "ash/root_window_controller.h"
-#include "ash/shelf/shelf_types.h"
-#include "ash/shelf/shelf_widget.h"
-#include "ash/shell.h"
-#include "ash/system/status_area_widget.h"
-#include "ash/test/ash_test_base.h"
-#include "ash/wm/overview/window_selector_controller.h"
-#include "base/time/time.h"
-#include "ui/events/event.h"
-#include "ui/events/event_constants.h"
-#include "ui/events/gestures/gesture_types.h"
-#include "ui/views/controls/image_view.h"
-
-namespace ash {
-
-namespace {
-
-OverviewButtonTray* GetTray() {
-  return Shell::GetPrimaryRootWindowController()->shelf()->
-      status_area_widget()->overview_button_tray();
-}
-
-OverviewButtonTray* GetSecondaryTray() {
-  internal::RootWindowController* primary_controller =
-      Shell::GetPrimaryRootWindowController();
-  Shell::RootWindowControllerList controllers =
-      Shell::GetAllRootWindowControllers();
-  for (size_t i = 0; i < controllers.size(); ++i) {
-    if (controllers[i] != primary_controller) {
-      return controllers[i]->shelf()->
-          status_area_widget()->overview_button_tray();
-    }
-  }
-
-  return NULL;
-}
-
-}  // namespace
-
-class OverviewButtonTrayTest : public test::AshTestBase {
- public:
-  OverviewButtonTrayTest() {}
-  virtual ~OverviewButtonTrayTest() {}
-
- protected:
-  views::ImageView* GetImageView(OverviewButtonTray* tray) {
-    return tray->icon_;
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(OverviewButtonTrayTest);
-};
-
-// Ensures that creation doesn't cause any crashes and adds the image icon.
-TEST_F(OverviewButtonTrayTest, BasicConstruction) {
-  EXPECT_TRUE(GetImageView(GetTray()) != NULL);
-}
-
-// Test that maximize mode toggle changes visibility.
-// OverviewButtonTray should only be visible when MaximizeMode is enabled.
-// By default the system should not have MaximizeMode enabled.
-TEST_F(OverviewButtonTrayTest, MaximizeModeObserverOnMaximizeModeToggled) {
-  ASSERT_FALSE(GetTray()->visible());
-  Shell::GetInstance()->EnableMaximizeModeWindowManager(true);
-  EXPECT_TRUE(GetTray()->visible());
-
-  Shell::GetInstance()->EnableMaximizeModeWindowManager(false);
-  EXPECT_FALSE(GetTray()->visible());
-}
-
-// Tests that activating this control brings up window selection mode.
-TEST_F(OverviewButtonTrayTest, PerformAction) {
-  ASSERT_FALSE(Shell::GetInstance()->window_selector_controller()->
-      IsSelecting());
-
-  // Overview Mode only works when there is a window
-  scoped_ptr<aura::Window> window(
-      CreateTestWindowInShellWithBounds(gfx::Rect(5, 5, 20, 20)));
-  ui::GestureEvent tap(ui::ET_GESTURE_TAP, 0, 0, 0, base::TimeDelta(),
-      ui::GestureEventDetails(ui::ET_GESTURE_TAP, 0.0f, 0.0f), 0);
-  GetTray()->PerformAction(tap);
-  EXPECT_TRUE(Shell::GetInstance()->window_selector_controller()->
-      IsSelecting());
-}
-
-// Tests that a second OverviewButtonTray has been created, and only shows
-// when MaximizeMode has been enabled,  when we are using multiple displays.
-// By default the DisplayManger is in extended mode.
-TEST_F(OverviewButtonTrayTest, DisplaysOnBothDisplays) {
-  if (!SupportsMultipleDisplays())
-    return;
-
-  UpdateDisplay("400x400,200x200");
-  EXPECT_FALSE(GetTray()->visible());
-  EXPECT_FALSE(GetSecondaryTray()->visible());
-  Shell::GetInstance()->EnableMaximizeModeWindowManager(true);
-  EXPECT_TRUE(GetTray()->visible());
-  EXPECT_TRUE(GetSecondaryTray()->visible());
-  Shell::GetInstance()->EnableMaximizeModeWindowManager(false);
-}
-
-// Tests if Maximize Mode is enabled before a secondary display is attached
-// that the second OverviewButtonTray should be created in a visible state.
-TEST_F(OverviewButtonTrayTest, SecondaryTrayCreatedVisible) {
-  if (!SupportsMultipleDisplays())
-    return;
-
-  Shell::GetInstance()->EnableMaximizeModeWindowManager(true);
-  UpdateDisplay("400x400,200x200");
-  EXPECT_TRUE(GetSecondaryTray()->visible());
-  Shell::GetInstance()->EnableMaximizeModeWindowManager(false);
-}
-
-}  // namespace ash
diff --git a/ash/system/status_area_widget.cc b/ash/system/status_area_widget.cc
index 798ea8e..d302efc 100644
--- a/ash/system/status_area_widget.cc
+++ b/ash/system/status_area_widget.cc
@@ -11,7 +11,6 @@
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/bluetooth/bluetooth_observer.h"
-#include "ash/system/overview/overview_button_tray.h"
 #include "ash/system/session/logout_button_tray.h"
 #include "ash/system/status_area_widget_delegate.h"
 #include "ash/system/tray/system_tray.h"
@@ -34,7 +33,6 @@ const char StatusAreaWidget::kNativeViewName[] = "StatusAreaWidget";
 
 StatusAreaWidget::StatusAreaWidget(aura::Window* status_container)
     : status_area_widget_delegate_(new internal::StatusAreaWidgetDelegate),
-      overview_button_tray_(NULL),
       system_tray_(NULL),
       web_notification_tray_(NULL),
       logout_button_tray_(NULL),
@@ -57,25 +55,26 @@ StatusAreaWidget::~StatusAreaWidget() {
 }
 
 void StatusAreaWidget::CreateTrayViews() {
-  AddOverviewButtonTray();
   AddSystemTray();
   AddWebNotificationTray();
   AddLogoutButtonTray();
 #if defined(OS_CHROMEOS)
   AddVirtualKeyboardTray();
 #endif
-
   SystemTrayDelegate* delegate =
       ash::Shell::GetInstance()->system_tray_delegate();
   DCHECK(delegate);
   // Initialize after all trays have been created.
-  system_tray_->InitializeTrayItems(delegate);
-  web_notification_tray_->Initialize();
-  logout_button_tray_->Initialize();
+  if (system_tray_)
+    system_tray_->InitializeTrayItems(delegate);
+  if (web_notification_tray_)
+    web_notification_tray_->Initialize();
+  if (logout_button_tray_)
+    logout_button_tray_->Initialize();
 #if defined(OS_CHROMEOS)
-  virtual_keyboard_tray_->Initialize();
+  if (virtual_keyboard_tray_)
+    virtual_keyboard_tray_->Initialize();
 #endif
-  overview_button_tray_->Initialize();
   UpdateAfterLoginStatusChange(delegate->GetUserLoginStatus());
 }
 
@@ -93,8 +92,6 @@ void StatusAreaWidget::Shutdown() {
   delete virtual_keyboard_tray_;
   virtual_keyboard_tray_ = NULL;
 #endif
-  delete overview_button_tray_;
-  overview_button_tray_ = NULL;
 }
 
 bool StatusAreaWidget::ShouldShowShelf() const {
@@ -109,8 +106,8 @@ bool StatusAreaWidget::ShouldShowShelf() const {
   // If the shelf is currently visible, don't hide the shelf if the mouse
   // is in any of the notification bubbles.
   return (system_tray_ && system_tray_->IsMouseInNotificationBubble()) ||
-         (web_notification_tray_ &&
-          web_notification_tray_->IsMouseInNotificationBubble());
+        (web_notification_tray_ &&
+         web_notification_tray_->IsMouseInNotificationBubble());
 }
 
 bool StatusAreaWidget::IsMessageBubbleShown() const {
@@ -147,11 +144,6 @@ void StatusAreaWidget::AddVirtualKeyboardTray() {
 }
 #endif
 
-void StatusAreaWidget::AddOverviewButtonTray() {
-  overview_button_tray_ = new OverviewButtonTray(this);
-  status_area_widget_delegate_->AddTray(overview_button_tray_);
-}
-
 void StatusAreaWidget::SetShelfAlignment(ShelfAlignment alignment) {
   status_area_widget_delegate_->set_alignment(alignment);
   if (system_tray_)
@@ -164,8 +156,6 @@ void StatusAreaWidget::SetShelfAlignment(ShelfAlignment alignment) {
   if (virtual_keyboard_tray_)
     virtual_keyboard_tray_->SetShelfAlignment(alignment);
 #endif
-  if (overview_button_tray_)
-    overview_button_tray_->SetShelfAlignment(alignment);
   status_area_widget_delegate_->UpdateLayout();
 }
 
diff --git a/ash/system/status_area_widget.h b/ash/system/status_area_widget.h
index 3b58a10..9933c73 100644
--- a/ash/system/status_area_widget.h
+++ b/ash/system/status_area_widget.h
@@ -12,7 +12,6 @@
 
 namespace ash {
 
-class OverviewButtonTray;
 class ShellDelegate;
 class SystemTray;
 class WebNotificationTray;
@@ -57,9 +56,6 @@ class ASH_EXPORT StatusAreaWidget : public views::Widget {
   WebNotificationTray* web_notification_tray() {
     return web_notification_tray_;
   }
-  OverviewButtonTray* overview_button_tray() {
-    return overview_button_tray_;
-  }
 
   user::LoginStatus login_status() const { return login_status_; }
 
@@ -81,11 +77,9 @@ class ASH_EXPORT StatusAreaWidget : public views::Widget {
 #if defined(OS_CHROMEOS)
   void AddVirtualKeyboardTray();
 #endif
-  void AddOverviewButtonTray();
 
   // Weak pointers to View classes that are parented to StatusAreaWidget:
   internal::StatusAreaWidgetDelegate* status_area_widget_delegate_;
-  OverviewButtonTray* overview_button_tray_;
   SystemTray* system_tray_;
   WebNotificationTray* web_notification_tray_;
   LogoutButtonTray* logout_button_tray_;
diff --git a/ash/wm/maximize_mode/maximize_mode_window_manager.cc b/ash/wm/maximize_mode/maximize_mode_window_manager.cc
index 24be9cb..6858f36 100644
--- a/ash/wm/maximize_mode/maximize_mode_window_manager.cc
+++ b/ash/wm/maximize_mode/maximize_mode_window_manager.cc
@@ -22,7 +22,6 @@ MaximizeModeWindowManager::~MaximizeModeWindowManager() {
   EnableBackdropBehindTopWindowOnEachDisplay(false);
   RemoveWindowCreationObservers();
   RestoreAllWindows();
-  Shell::GetInstance()->OnMaximizeModeEnded();
 }
 
 int MaximizeModeWindowManager::GetNumberOfManagedWindows() {
@@ -94,7 +93,6 @@ MaximizeModeWindowManager::MaximizeModeWindowManager()
   MaximizeAllWindows();
   AddWindowCreationObservers();
   EnableBackdropBehindTopWindowOnEachDisplay(true);
-  Shell::GetInstance()->OnMaximizeModeStarted();
   Shell::GetScreen()->AddObserver(this);
   Shell::GetInstance()->AddShellObserver(this);
 }