Fix virtual/override/final usage in Source/web/.

Source/web/GraphicsLayerFactoryChromium.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 17 matching lines @@
 
 #include "platform/graphics/GraphicsLayerFactory.h"
 
 namespace blink {
 class WebViewImpl;
 
 class GraphicsLayerFactoryChromium final : public GraphicsLayerFactory {
 public:
     explicit GraphicsLayerFactoryChromium(WebViewImpl*);
 
-    virtual ~GraphicsLayerFactoryChromium();
+    ~GraphicsLayerFactoryChromium() override;
 
-    virtual PassOwnPtr<GraphicsLayer> createGraphicsLayer(GraphicsLayerClient*) override;
+    PassOwnPtr<GraphicsLayer> createGraphicsLayer(GraphicsLayerClient*) override;
 
 private:
     // The owner of this GraphicsLayerFactoryChromium.
     WebViewImpl* m_webView;
 };
 
 } // namespace blink
 
 #endif