Change various helper classes to transition types to get CSSValue entirely onto the gc heap.

Source/core/css/MediaQueryList.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  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
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Library General Public License for more details.
  *
  *  You should have received a copy of the GNU Library General Public License
  *  along with this library; see the file COPYING.LIB.  If not, write to
  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  *  Boston, MA 02110-1301, USA.
  */
 
 #ifndef MediaQueryList_h
 #define MediaQueryList_h
 
+#include "heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class MediaQueryListListener;
 class MediaQueryEvaluator;
 class MediaQueryMatcher;
 class MediaQuerySet;
 
 // MediaQueryList interface is specified at http://dev.w3.org/csswg/cssom-view/#the-mediaquerylist-interface
 // The objects of this class are returned by window.matchMedia. They may be used to
 // retrieve the current value of the given media query and to add/remove listeners that
 // will be called whenever the value of the query changes.
 
 class MediaQueryList : public RefCounted<MediaQueryList> {
 public:
-    static PassRefPtr<MediaQueryList> create(PassRefPtr<MediaQueryMatcher>, PassRefPtr<MediaQuerySet>, bool);
+    static PassRefPtr<MediaQueryList> create(PassRefPtr<MediaQueryMatcher>, PassRefPtrWillBeRawPtr<MediaQuerySet>, bool);
     ~MediaQueryList();
 
     String media() const;
     bool matches();
 
     void addListener(PassRefPtr<MediaQueryListListener>);
     void removeListener(PassRefPtr<MediaQueryListListener>);
 
     void evaluate(MediaQueryEvaluator*, bool& notificationNeeded);
 
 private:
-    MediaQueryList(PassRefPtr<MediaQueryMatcher>, PassRefPtr<MediaQuerySet>, bool matches);
+    MediaQueryList(PassRefPtr<MediaQueryMatcher>, PassRefPtrWillBeRawPtr<MediaQuerySet>, bool matches);
     void setMatches(bool);
 
     RefPtr<MediaQueryMatcher> m_matcher;
-    RefPtr<MediaQuerySet> m_media;
+    RefPtrWillBePersistent<MediaQuerySet> m_media;
     unsigned m_evaluationRound; // Indicates if the query has been evaluated after the last style selector change.
     unsigned m_changeRound; // Used to know if the query has changed in the last style selector change.
     bool m_matches;
 };
 
 }
 
 #endif // MediaQueryList_h