Add more missing closing namespace comments.

third_party/WebKit/Source/platform/weborigin/Referrer.h

 /*
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 28 matching lines @@
 
 struct Referrer {
     DISALLOW_NEW();
     Referrer(const String& referrer, ReferrerPolicy referrerPolicy) : referrer(referrer), referrerPolicy(referrerPolicy) { }
     Referrer() : referrerPolicy(ReferrerPolicyDefault) { }
 
     AtomicString referrer;
     ReferrerPolicy referrerPolicy;
 };
 
-}
+} // namespace blink
 
 #endif // Referrer_h