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

Source/platform/graphics/LoggingCanvas.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 116 matching lines @@
     PassRefPtr<JSONObject> objectForSkPaint(const SkPaint&);
     PassRefPtr<JSONArray> arrayForSkMatrix(const SkMatrix&);
     PassRefPtr<JSONArray> arrayForSkScalars(size_t n, const SkScalar scalars[]);
     String regionOpName(SkRegion::Op);
     String saveFlagsToString(SkCanvas::SaveFlags);
     String textEncodingCanonicalName(SkPaint::TextEncoding);
     String stringForUTFText(const void* text, size_t length, SkPaint::TextEncoding);
     String stringForText(const void* text, size_t byteLength, const SkPaint&);
 };
 
-}
+} // namespace blink
 
 #endif // LoggingCanvas_h