Move MediaQuery classes off BlinkGC heap

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

 /*
  * Copyright (C) 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 35 matching lines @@
 bool StyleMedia::matchMedium(const String& query) const {
   if (!GetFrame())
     return false;
 
   Document* document = GetFrame()->GetDocument();
   DCHECK(document);
   Element* document_element = document->documentElement();
   if (!document_element)
     return false;
 
-  MediaQuerySet* media = MediaQuerySet::Create();
+  RefPtr<MediaQuerySet> media = MediaQuerySet::Create();
   if (!media->Set(query))
     return false;
 
   MediaQueryEvaluator screen_eval(GetFrame());
-  return screen_eval.Eval(media);
+  return screen_eval.Eval(*media);
 }
 
 DEFINE_TRACE(StyleMedia) {
   ContextClient::Trace(visitor);
 }
 
 }  // namespace blink