Add more missing closing namespace comments.

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

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * 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
@@ skipping 748 matching lines @@
 
     if (functionMapIter == functionMap->end() || !(functionRec = &functionMapIter->value)->args.contains(args.size()))
         return nullptr;
 
     Function* function = functionRec->factoryFn();
     function->setArguments(args);
     function->setName(name);
     return function;
 }
 
-}
-}
+} // namespace XPath
+} // namespace blink