Add more missing closing namespace comments.

third_party/WebKit/Source/core/html/PublicURLManager.cpp

 /*
  * Copyright (C) 2012 Motorola Mobility Inc.
  * Copyright (C) 2013 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.
@@ skipping 90 matching lines @@
     }
 
     m_registryToURL.clear();
 }
 
 DEFINE_TRACE(PublicURLManager)
 {
     ActiveDOMObject::trace(visitor);
 }
 
-}
+} // namespace blink