Add missing closing namespace comments to wtf.

third_party/WebKit/Source/wtf/LinkedHashSet.h

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, Benjamin Poulain <ikipou@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 720 matching lines @@
 }
 
 #if !ENABLE(OILPAN)
 template<typename T, typename U, typename V>
 struct NeedsTracing<LinkedHashSet<T, U, V>> {
     STATIC_ONLY(NeedsTracing);
     static const bool value = false;
 };
 #endif
 
-}
+} // namespace WTF
 
 using WTF::LinkedHashSet;
 
 #endif /* WTF_LinkedHashSet_h */