Add more missing closing namespace comments.

third_party/WebKit/Source/platform/SharedBufferChunkReader.cpp

 /*
  * Copyright (C) 2011 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 128 matching lines @@
             readBytesCount += (requestedSize - readBytesCount);
             break;
         }
         data.append(segment, segmentLength);
         readBytesCount += segmentLength;
         bufferPosition += segmentLength;
     }
     return readBytesCount;
 }
 
-}
+} // namespace blink