Add missing closing namespace comments to wtf.

third_party/WebKit/Source/wtf/text/StringImplMac.mm

 /*
  * Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 26 matching lines @@
         CFMakeCollectable(object);
     [(id)object autorelease];
     return (id)object;
 }
 
 StringImpl::operator NSString *()
 {
     return HardAutorelease(createCFString().leakRef());
 }
 
-}
+} // namespace WTF