Standardize usage of virtual/override/final specifiers.

ash/wm/gestures/tray_gesture_handler.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_WM_GESTURES_TRAY_GESTURE_HANDLER_H_
 #define ASH_WM_GESTURES_TRAY_GESTURE_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace ui {
 class GestureEvent;
 }
 
 namespace ash {
 
 // Handles gesture events on the shelf to show the system tray bubble.
 class TrayGestureHandler : public views::WidgetObserver {
  public:
   TrayGestureHandler();
-  virtual ~TrayGestureHandler();
+  ~TrayGestureHandler() override;
 
   // Handles a gesture-update event and updates the dragging state of the tray
   // bubble. Returns true if the handler can continue to process gesture events
   // for the bubble. Returns false if it should no longer receive gesture
   // events.
   bool UpdateGestureDrag(const ui::GestureEvent& event);
 
   void CompleteGestureDrag(const ui::GestureEvent& event);
 
  private:
-  virtual void OnWidgetDestroying(views::Widget* widget) override;
+  void OnWidgetDestroying(views::Widget* widget) override;
 
   // The widget for the tray-bubble.
   views::Widget* widget_;
 
   // The amount that has been dragged.
   float gesture_drag_amount_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayGestureHandler);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_GESTURES_TRAY_GESTURE_HANDLER_H_