Add more missing closing namespace comments.

third_party/WebKit/Source/core/xml/XPathValue.cpp

 /*
  * 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 126 matching lines @@
         if (std::isinf(m_number))
             return std::signbit(m_number) ? "-Infinity" : "Infinity";
         return String::number(m_number);
     case BooleanValue:
         return m_bool ? "true" : "false";
     }
     ASSERT_NOT_REACHED();
     return String();
 }
 
-}
-}
+} // namespace XPath
+} // namespace blink