Standardize usage of virtual/override/final in cc/

cc/layers/picture_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_PICTURE_IMAGE_LAYER_H_
 #define CC_LAYERS_PICTURE_IMAGE_LAYER_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 
 class CC_EXPORT PictureImageLayer : public PictureLayer, ContentLayerClient {
  public:
   static scoped_refptr<PictureImageLayer> Create();
 
   void SetBitmap(const SkBitmap& image);
 
   // Layer implementation.
-  virtual scoped_ptr<LayerImpl> CreateLayerImpl(
-      LayerTreeImpl* tree_impl) override;
+  scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
 
   // ContentLayerClient implementation.
-  virtual void PaintContents(
+  void PaintContents(
       SkCanvas* canvas,
       const gfx::Rect& clip,
       ContentLayerClient::GraphicsContextStatus gc_status) override;
-  virtual void DidChangeLayerCanUseLCDText() override {}
-  virtual bool FillsBoundsCompletely() const override;
+  void DidChangeLayerCanUseLCDText() override {}
+  bool FillsBoundsCompletely() const override;
 
  protected:
-  virtual bool HasDrawableContent() const override;
+  bool HasDrawableContent() const override;
 
  private:
   PictureImageLayer();
-  virtual ~PictureImageLayer();
+  ~PictureImageLayer() override;
 
   SkBitmap bitmap_;
 
   DISALLOW_COPY_AND_ASSIGN(PictureImageLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_PICTURE_IMAGE_LAYER_H_