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

ash/display/resolution_notification_controller.h

 // Copyright 2013 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_RESOLUTION_NOTIFICATION_CONTROLLER_H_
 #define ASH_DISPLAY_RESOLUTION_NOTIFICATION_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/display/display_controller.h"
 #include "base/callback.h"
@@ skipping 15 matching lines @@
 
 struct DisplayMode;
 
 // A class which manages the notification of display resolution change and
 // also manages the timeout in case the new resolution is unusable.
 class ASH_EXPORT ResolutionNotificationController
     : public gfx::DisplayObserver,
       public DisplayController::Observer {
  public:
   ResolutionNotificationController();
-  virtual ~ResolutionNotificationController();
+  ~ResolutionNotificationController() override;
 
   // Prepare a resolution change notification for |display_id| from
   // |old_resolution| to |new_resolution|, which offers a button to revert the
   // change in case something goes wrong. The notification times out if there's
   // only one display connected and the user is trying to modify its resolution.
   // In that case, the timeout has to be set since the user cannot make any
   // changes if something goes wrong.
   //
   // This method does not create a notification itself. The notification will be
   // created the next OnDisplayConfigurationChanged(), which will be called
@@ skipping 32 matching lines @@
   // Create a new notification, or update its content if it already exists.
   // |enable_spoken_feedback| is set to false when the notification is updated
   // during the countdown so the update isn't necessarily read by the spoken
   // feedback.
   void CreateOrUpdateNotification(bool enable_spoken_feedback);
 
   // Called every second for timeout.
   void OnTimerTick();
 
   // gfx::DisplayObserver overrides:
-  virtual void OnDisplayAdded(const gfx::Display& new_display) override;
-  virtual void OnDisplayRemoved(const gfx::Display& old_display) override;
-  virtual void OnDisplayMetricsChanged(const gfx::Display& display,
-                                       uint32_t metrics) override;
+  void OnDisplayAdded(const gfx::Display& new_display) override;
+  void OnDisplayRemoved(const gfx::Display& old_display) override;
+  void OnDisplayMetricsChanged(const gfx::Display& display,
+                               uint32_t metrics) override;
 
   // DisplayController::Observer overrides:
-  virtual void OnDisplayConfigurationChanged() override;
+  void OnDisplayConfigurationChanged() override;
 
   static void SuppressTimerForTest();
 
   scoped_ptr<ResolutionChangeInfo> change_info_;
 
   DISALLOW_COPY_AND_ASSIGN(ResolutionNotificationController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_RESOLUTION_NOTIFICATION_CONTROLLER_H_