Update {virtual,override,final} to follow C++11 style in ash.

ash/display/display_configurator_animation.h

 // 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_DISPLAY_DISPLAY_CONFIGURATOR_ANIMATION_H_
 #define ASH_DISPLAY_DISPLAY_CONFIGURATOR_ANIMATION_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
@@ skipping 13 matching lines @@
 
 namespace ash {
 
 // DisplayConfiguratorAnimation provides the visual effects for
 // ui::DisplayConfigurator, such like fade-out/in during changing
 // the display mode.
 class ASH_EXPORT DisplayConfiguratorAnimation
     : public ui::DisplayConfigurator::Observer {
  public:
   DisplayConfiguratorAnimation();
-  virtual ~DisplayConfiguratorAnimation();
+  ~DisplayConfiguratorAnimation() override;
 
   // Starts the fade-out animation for the all root windows.  It will
   // call |callback| once all of the animations have finished.
   void StartFadeOutAnimation(base::Closure callback);
 
   // Starts the animation to clear the fade-out animation effect
   // for the all root windows.
   void StartFadeInAnimation();
 
  protected:
   // ui::DisplayConfigurator::Observer overrides:
-  virtual void OnDisplayModeChanged(
+  void OnDisplayModeChanged(
       const ui::DisplayConfigurator::DisplayStateList& outputs) override;
-  virtual void OnDisplayModeChangeFailed(
+  void OnDisplayModeChangeFailed(
       ui::MultipleDisplayState failed_new_state) override;
 
  private:
   // Clears all hiding layers.  Note that in case that this method is called
   // during an animation, the method call will cancel all of the animations
   // and *not* call the registered callback.
   void ClearHidingLayers();
 
   std::map<aura::Window*, ui::Layer*> hiding_layers_;
   scoped_ptr<base::OneShotTimer<DisplayConfiguratorAnimation> > timer_;
   base::WeakPtrFactory<DisplayConfiguratorAnimation> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayConfiguratorAnimation);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_CONFIGURATION_CONTROLLER_H_