Add more missing closing namespace comments.

third_party/WebKit/Source/core/html/parser/HTMLTreeBuilder.h

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  * Copyright (C) 2011 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
@@ skipping 220 matching lines @@
     // We access parser because HTML5 spec requires that we be able to change the state of the tokenizer
     // from within parser actions. We also need it to track the current position.
     RawPtrWillBeMember<HTMLDocumentParser> m_parser;
 
     RefPtrWillBeMember<Element> m_scriptToProcess; // <script> tag which needs processing before resuming the parser.
     TextPosition m_scriptToProcessStartPosition; // Starting line number of the script tag needing processing.
 
     HTMLParserOptions m_options;
 };
 
-}
+} // namespace blink
 
 #endif