Add more missing closing namespace comments.

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

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 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.
@@ skipping 200 matching lines @@
         return nullptr;
     }
 
     const NodeSet& nodes = m_value.toNodeSet(0);
     if (index >= nodes.size())
         return nullptr;
 
     return nodes[index];
 }
 
-}
+} // namespace blink