Cleanup namespace usage in platform/graphics/[G-S]*

Source/platform/graphics/GraphicsContextRecorder.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 56 matching lines @@
     GraphicsContext* record(const IntSize&, bool isCertainlyOpaque);
     PassRefPtr<GraphicsContextSnapshot> stop();
 
 private:
     RefPtr<SkPicture> m_picture;
     OwnPtr<GraphicsContext> m_context;
     OwnPtr<SkPictureRecorder> m_recorder;
     bool m_isCertainlyOpaque;
 };
 
-}
+} // namespace blink
 
 #endif // GraphicsContextRecorder_h