Add more missing closing namespace comments.

third_party/WebKit/Source/core/editing/serializers/MarkupAccumulator.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010 Google 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 182 matching lines @@
         namespaceHash.set(xmlAtom, XMLNames::xmlNamespaceURI);
         namespaces = &namespaceHash;
     }
 
     serializeNodesWithNamespaces<Strategy>(accumulator, targetNode, childrenOnly, namespaces);
     return accumulator.toString();
 }
 
 template String serializeNodes<EditingStrategy>(MarkupAccumulator&, Node&, EChildrenOnly);
 
-}
+} // namespace blink