Standardize usage of virtual/override/final in cc/

cc/layers/image_layer.h

 // Copyright 2010 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_LAYERS_IMAGE_LAYER_H_
 #define CC_LAYERS_IMAGE_LAYER_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/layers/content_layer.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace cc {
 
 class ImageLayerUpdater;
 
 // A Layer that contains only an Image element.
 class CC_EXPORT ImageLayer : public TiledLayer {
  public:
   static scoped_refptr<ImageLayer> Create();
 
   // Layer implementation.
-  virtual void SetTexturePriorities(const PriorityCalculator& priority_calc)
-      override;
-  virtual bool Update(ResourceUpdateQueue* queue,
-                      const OcclusionTracker<Layer>* occlusion) override;
-  virtual void CalculateContentsScale(float ideal_contents_scale,
-                                      float* contents_scale_x,
-                                      float* contents_scale_y,
-                                      gfx::Size* content_bounds) override;
-  virtual void OnOutputSurfaceCreated() override;
+  void SetTexturePriorities(const PriorityCalculator& priority_calc) override;
+  bool Update(ResourceUpdateQueue* queue,
+              const OcclusionTracker<Layer>* occlusion) override;
+  void CalculateContentsScale(float ideal_contents_scale,
+                              float* contents_scale_x,
+                              float* contents_scale_y,
+                              gfx::Size* content_bounds) override;
+  void OnOutputSurfaceCreated() override;
 
   void SetBitmap(const SkBitmap& image);
 
  protected:
-  virtual bool HasDrawableContent() const override;
+  bool HasDrawableContent() const override;
 
  private:
   ImageLayer();
-  virtual ~ImageLayer();
+  ~ImageLayer() override;
 
   // TiledLayer Implementation.
-  virtual LayerUpdater* Updater() const override;
-  virtual void CreateUpdaterIfNeeded() override;
+  LayerUpdater* Updater() const override;
+  void CreateUpdaterIfNeeded() override;
 
   float ImageContentsScaleX() const;
   float ImageContentsScaleY() const;
 
   SkBitmap bitmap_;
 
   scoped_refptr<ImageLayerUpdater> updater_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_IMAGE_LAYER_H_