Cleanup namespace usage in platform/graphics/[filters/* to skia/*] and platform/graphics/[B-D]*

Source/platform/graphics/DisplayList.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 52 matching lines @@
     SkCanvas* beginRecording(const IntSize&, uint32_t recordFlags = 0);
     bool isRecording() const { return m_recorder; }
     void endRecording();
 
 private:
     FloatRect m_bounds;
     RefPtr<SkPicture> m_picture;
     OwnPtr<SkPictureRecorder> m_recorder;
 };
 
-}
+} // namespace blink
 
 #endif // DisplayList_h