Add more missing closing namespace comments.

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

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
  * 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 414 matching lines @@
             if (nodeMatches(evaluationContext, n, AncestorOrSelfAxis, nodeTest()))
                 nodes.append(n);
         }
         nodes.markSorted(false);
         return;
     }
     }
     ASSERT_NOT_REACHED();
 }
 
-}
+} // namespace XPath
 
-}
+} // namespace blink