Remove --ash-disable-overview-mode

ash/ash_switches.h

 // 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 ASH_ASH_SWITCHES_H_
 #define ASH_ASH_SWITCHES_H_
 
 #include "ash/ash_export.h"
 
 #include "build/build_config.h"
@@ skipping 13 matching lines @@
 ASH_EXPORT extern const char kAshDefaultWallpaperIsOem[];
 ASH_EXPORT extern const char kAshDefaultWallpaperLarge[];
 ASH_EXPORT extern const char kAshDefaultWallpaperSmall[];
 ASH_EXPORT extern const char kAshDisableAlternateFrameCaptionButtonStyle[];
 
 #if defined(OS_CHROMEOS)
 ASH_EXPORT extern const char kAshDisableAudioDeviceMenu[];
 #endif
 
 ASH_EXPORT extern const char kAshDisableDockedWindows[];
-ASH_EXPORT extern const char kAshDisableOverviewMode[];
 ASH_EXPORT extern const char kAshEnableAlternateFrameCaptionButtonStyle[];
 ASH_EXPORT extern const char kAshEnableBrightnessControl[];
 ASH_EXPORT extern const char kAshEnableImmersiveFullscreenForAllWindows[];
 ASH_EXPORT extern const char kAshEnableImmersiveFullscreenForBrowserOnly[];
 #if defined(OS_CHROMEOS)
 ASH_EXPORT extern const char kAshEnableMagnifierKeyScroller[];
 ASH_EXPORT extern const char kAshEnableMultiUserTray[];
 #endif
 ASH_EXPORT extern const char kAshEnableSoftwareMirroring[];
 ASH_EXPORT extern const char kAshEnableSystemSounds[];
@@ skipping 15 matching lines @@
 // maximize, restore, close) should be used.
 ASH_EXPORT bool UseAlternateFrameCaptionButtonStyle();
 
 // Returns true if items can be dragged off the shelf to unpin.
 ASH_EXPORT bool UseDragOffShelf();
 
 // Returns true if all windows (barring frameless apps) can be put into
 // immersive fullscreen via <F4>.
 ASH_EXPORT bool UseImmersiveFullscreenForAllWindows();
 
-// Returns true if overview mode should be activated for window switching.
-ASH_EXPORT bool UseOverviewMode();
-
 // Returns true if docked windows feature is enabled.
 ASH_EXPORT bool UseDockedWindows();
 
 #if defined(OS_CHROMEOS)
 // Returns true if a notification should appear when a low-power USB charger
 // is connected.
 ASH_EXPORT bool UseUsbChargerNotification();
 #endif
 
 }  // namespace switches
 }  // namespace ash
 
 #endif  // ASH_ASH_SWITCHES_H_