Standardize usage of virtual/override/final in cc/

cc/layers/solid_color_layer.h

 // Copyright 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 CC_LAYERS_SOLID_COLOR_LAYER_H_
 #define CC_LAYERS_SOLID_COLOR_LAYER_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer.h"
 
 namespace cc {
 
 // A Layer that renders a solid color. The color is specified by using
 // SetBackgroundColor() on the base class.
 class CC_EXPORT SolidColorLayer : public Layer {
  public:
   static scoped_refptr<SolidColorLayer> Create();
 
-  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
-      override;
+  scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
 
-  virtual void SetBackgroundColor(SkColor color) override;
+  void SetBackgroundColor(SkColor color) override;
 
  protected:
   SolidColorLayer();
 
  private:
-  virtual ~SolidColorLayer();
+  ~SolidColorLayer() override;
 
   DISALLOW_COPY_AND_ASSIGN(SolidColorLayer);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_SOLID_COLOR_LAYER_H_