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

ash/display/resolution_notification_controller.cc

 // 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.
 
 #include "ash/display/resolution_notification_controller.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
@@ skipping 18 matching lines @@
 bool g_use_timer = true;
 
 class ResolutionChangeNotificationDelegate
     : public message_center::NotificationDelegate {
  public:
   ResolutionChangeNotificationDelegate(
       ResolutionNotificationController* controller,
       bool has_timeout);
 
  protected:
-  virtual ~ResolutionChangeNotificationDelegate();
+  ~ResolutionChangeNotificationDelegate() override;
 
  private:
   // message_center::NotificationDelegate overrides:
-  virtual void Close(bool by_user) override;
-  virtual void Click() override;
-  virtual bool HasClickedListener() override;
-  virtual void ButtonClick(int button_index) override;
+  void Close(bool by_user) override;
+  void Click() override;
+  bool HasClickedListener() override;
+  void ButtonClick(int button_index) override;
 
   ResolutionNotificationController* controller_;
   bool has_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(ResolutionChangeNotificationDelegate);
 };
 
 ResolutionChangeNotificationDelegate::ResolutionChangeNotificationDelegate(
     ResolutionNotificationController* controller,
     bool has_timeout)
@@ skipping 244 matching lines @@
                               this,
                               &ResolutionNotificationController::OnTimerTick);
   }
 }
 
 void ResolutionNotificationController::SuppressTimerForTest() {
   g_use_timer = false;
 }
 
 }  // namespace ash