Add more missing closing namespace comments.

third_party/WebKit/Source/core/css/MediaQuery.cpp

 /*
  * CSS Media Query
  *
  * Copyright (C) 2005, 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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
@@ skipping 123 matching lines @@
 
 DEFINE_TRACE(MediaQuery)
 {
     // We don't support tracing of vectors of OwnPtrs (ie. OwnPtr<Vector<OwnPtr<MediaQuery>>>).
     // Since this is a transitional object we are just ifdef'ing it out when oilpan is not enabled.
 #if ENABLE(OILPAN)
     visitor->trace(m_expressions);
 #endif
 }
 
-}
+} // namespace blink