Add more missing closing namespace comments.

third_party/WebKit/Source/core/page/DragData.h

 /*
  * Copyright (C) 2007 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 64 matching lines @@
     String droppedFileSystemId() const;
 
 private:
     IntPoint m_clientPosition;
     IntPoint m_globalPosition;
     Member<DataObject> m_platformDragData;
     DragOperation m_draggingSourceOperationMask;
     DragApplicationFlags m_applicationFlags;
 };
 
-}
+} // namespace blink
 
 #endif // !DragData_h