Add more missing closing namespace comments.

third_party/WebKit/Source/core/css/parser/CSSParserString.h

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 84 matching lines @@
 
     union {
         const LChar* characters8;
         const UChar* characters16;
         const void* charactersRaw;
     } m_data;
     unsigned m_length;
     bool m_is8Bit;
 };
 
-}
+} // namespace blink
 
 #endif