Standardize usage of virtual/override/final in cc/

cc/animation/scrollbar_animation_controller_thinning.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 CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_
 #define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
 class LayerImpl;
 
 // Scrollbar animation that partially fades and thins after an idle delay,
 // and reacts to mouse movements.
 class CC_EXPORT ScrollbarAnimationControllerThinning
     : public ScrollbarAnimationController {
  public:
   static scoped_ptr<ScrollbarAnimationControllerThinning> Create(
       LayerImpl* scroll_layer,
       ScrollbarAnimationControllerClient* client,
       base::TimeDelta delay_before_starting,
       base::TimeDelta resize_delay_before_starting,
       base::TimeDelta duration);
 
-  virtual ~ScrollbarAnimationControllerThinning();
+  ~ScrollbarAnimationControllerThinning() override;
 
   void set_mouse_move_distance_for_test(float distance) {
     mouse_move_distance_to_trigger_animation_ = distance;
   }
   bool mouse_is_over_scrollbar() const { return mouse_is_over_scrollbar_; }
   bool mouse_is_near_scrollbar() const { return mouse_is_near_scrollbar_; }
 
-  virtual void DidScrollUpdate(bool on_resize) override;
-  virtual void DidMouseMoveOffScrollbar() override;
-  virtual void DidMouseMoveNear(float distance) override;
+  void DidScrollUpdate(bool on_resize) override;
+  void DidMouseMoveOffScrollbar() override;
+  void DidMouseMoveNear(float distance) override;
 
  protected:
   ScrollbarAnimationControllerThinning(
       LayerImpl* scroll_layer,
       ScrollbarAnimationControllerClient* client,
       base::TimeDelta delay_before_starting,
       base::TimeDelta resize_delay_before_starting,
       base::TimeDelta duration);
 
-  virtual void RunAnimationFrame(float progress) override;
+  void RunAnimationFrame(float progress) override;
 
  private:
   // Describes whether the current animation should INCREASE (darken / thicken)
   // a bar or DECREASE it (lighten / thin).
   enum AnimationChange {
     NONE,
     INCREASE,
     DECREASE
   };
   float OpacityAtAnimationProgress(float progress);
@@ skipping 14 matching lines @@
   AnimationChange opacity_change_;
   // How close should the mouse be to the scrollbar before we thicken it.
   float mouse_move_distance_to_trigger_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerThinning);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_