Add more missing closing namespace comments.

third_party/WebKit/Source/core/xml/XPathUtil.h

 /*
  * Copyright 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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.
@@ skipping 26 matching lines @@
 
 // @return whether the given node is the root node
 bool isRootDomNode(Node*);
 
 // @return the 'string-value' of the given node as specified by http://www.w3.org/TR/xpath
 String stringValue(Node*);
 
 // @return whether the given node is a valid context node
 bool isValidContextNode(Node*);
 
-}
+} // namespace XPath
 
-}
+} // namespace blink
 #endif // XPathUtil_h