Add more missing closing namespace comments.

third_party/WebKit/Source/core/html/parser/HTMLSourceTracker.cpp

 /*
  * Copyright (C) 2010 Adam Barth. 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 73 matching lines @@
     for ( ; i < length; ++i) {
         ASSERT(!m_currentSource.isEmpty());
         source.append(m_currentSource.currentChar());
         m_currentSource.advance();
     }
 
     m_cachedSourceForToken = source.toString();
     return m_cachedSourceForToken;
 }
 
-}
+} // namespace blink