Add missing closing namespace comments to wtf.

third_party/WebKit/Source/wtf/text/StringView.h

 /*
  * 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:
  *
  *     * 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 85 matching lines @@
             return StringImpl::create(characters8(), m_length);
         return StringImpl::create(characters16(), m_length);
     }
 
 private:
     RefPtr<StringImpl> m_impl;
     unsigned m_offset;
     unsigned m_length;
 };
 
-}
+} // namespace WTF
 
 using WTF::StringView;
 
 #endif