Standardize usage of virtual/override/final specifiers.

ash/desktop_background/desktop_background_controller.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_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
 #define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/display/display_controller.h"
 #include "ash/shell_observer.h"
@@ skipping 40 matching lines @@
       public ShellObserver {
  public:
   class TestAPI;
 
   enum BackgroundMode {
     BACKGROUND_NONE,
     BACKGROUND_IMAGE,
   };
 
   DesktopBackgroundController();
-  virtual ~DesktopBackgroundController();
+  ~DesktopBackgroundController() override;
 
   BackgroundMode desktop_background_mode() const {
     return desktop_background_mode_;
   }
 
   // Add/Remove observers.
   void AddObserver(DesktopBackgroundControllerObserver* observer);
   void RemoveObserver(DesktopBackgroundControllerObserver* observer);
 
   // Provides current image on the background, or empty gfx::ImageSkia if there
@@ skipping 18 matching lines @@
 
   // Move all desktop widgets to locked container.
   // Returns true if the desktop moved.
   bool MoveDesktopToLockedContainer();
 
   // Move all desktop widgets to unlocked container.
   // Returns true if the desktop moved.
   bool MoveDesktopToUnlockedContainer();
 
   // DisplayController::Observer:
-  virtual void OnDisplayConfigurationChanged() override;
+  void OnDisplayConfigurationChanged() override;
 
   // ShellObserver:
-  virtual void OnRootWindowAdded(aura::Window* root_window) override;
+  void OnRootWindowAdded(aura::Window* root_window) override;
 
   // Returns the maximum size of all displays combined in native
   // resolutions.  Note that this isn't the bounds of the display who
   // has maximum resolutions. Instead, this returns the size of the
   // maximum width of all displays, and the maximum height of all displays.
   static gfx::Size GetMaxDisplaySizeInNative();
 
   // Returns true if the specified wallpaper is already stored
   // in |current_wallpaper_|.
   // If |compare_layouts| is false, layout is ignored.
@@ skipping 52 matching lines @@
   base::OneShotTimer<DesktopBackgroundController> timer_;
 
   int wallpaper_reload_delay_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_