Standardize usage of virtual/override/final specifiers.

ash/display/event_transformation_handler.h

 // Copyright (c) 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_EVENT_TRANSFORMATION_HANDLER_H_
 #define ASH_DISPLAY_EVENT_TRANSFORMATION_HANDLER_H_
 
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
 #include "ui/events/event_handler.h"
 
 namespace ash {
 
 // An event filter that transforms input event properties in extended desktop
 // environment.
 class ASH_EXPORT EventTransformationHandler : public ui::EventHandler {
  public:
   enum TransformationMode {
     TRANSFORM_AUTO,   // Transform events by the default amount.
                       // 1. Linear scaling w.r.t. the device scale factor.
                       // 2. Add 20% more for non-integrated displays.
     TRANSFORM_NONE,   // No transformation.
   };
 
   EventTransformationHandler();
-  virtual ~EventTransformationHandler();
+  ~EventTransformationHandler() override;
 
   void set_transformation_mode(TransformationMode transformation_mode) {
     transformation_mode_ = transformation_mode;
   }
 
   // Overridden from ui::EventHandler.
-  virtual void OnScrollEvent(ui::ScrollEvent* event) override;
+  void OnScrollEvent(ui::ScrollEvent* event) override;
 
  private:
   TransformationMode transformation_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(EventTransformationHandler);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_EVENT_TRANSFORMATION_HANDLER_H_