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

Source/core/css/StyleRule.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012, 2013 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.
  *
@@ skipping 177 matching lines @@
 protected:
     StyleRuleGroup(Type, Vector<RefPtr<StyleRuleBase> >& adoptRule);
     StyleRuleGroup(const StyleRuleGroup&);
 
 private:
     Vector<RefPtr<StyleRuleBase> > m_childRules;
 };
 
 class StyleRuleMedia : public StyleRuleGroup {
 public:
-    static PassRefPtrWillBeRawPtr<StyleRuleMedia> create(PassRefPtr<MediaQuerySet> media, Vector<RefPtr<StyleRuleBase> >& adoptRules)
+    static PassRefPtrWillBeRawPtr<StyleRuleMedia> create(PassRefPtrWillBeRawPtr<MediaQuerySet> media, Vector<RefPtr<StyleRuleBase> >& adoptRules)
     {
         return adoptRefCountedWillBeRefCountedGarbageCollected(new StyleRuleMedia(media, adoptRules));
     }
 
     MediaQuerySet* mediaQueries() const { return m_mediaQueries.get(); }
 
     PassRefPtr<StyleRuleMedia> copy() const { return adoptRefCountedWillBeRefCountedGarbageCollected(new StyleRuleMedia(*this)); }
 
     void traceAfterDispatch(Visitor* visitor) { StyleRuleGroup::traceAfterDispatch(visitor); }
 
 private:
-    StyleRuleMedia(PassRefPtr<MediaQuerySet>, Vector<RefPtr<StyleRuleBase> >& adoptRules);
+    StyleRuleMedia(PassRefPtrWillBeRawPtr<MediaQuerySet>, Vector<RefPtr<StyleRuleBase> >& adoptRules);
     StyleRuleMedia(const StyleRuleMedia&);
 
-    RefPtr<MediaQuerySet> m_mediaQueries;
+    RefPtrWillBePersistent<MediaQuerySet> m_mediaQueries;
 };
 
 class StyleRuleSupports : public StyleRuleGroup {
 public:
     static PassRefPtrWillBeRawPtr<StyleRuleSupports> create(const String& conditionText, bool conditionIsSupported, Vector<RefPtr<StyleRuleBase> >& adoptRules)
     {
         return adoptRefCountedWillBeRefCountedGarbageCollected(new StyleRuleSupports(conditionText, conditionIsSupported, adoptRules));
     }
 
     String conditionText() const { return m_conditionText; }
@@ skipping 64 matching lines @@
 DEFINE_STYLE_RULE_TYPE_CASTS(FontFace);
 DEFINE_STYLE_RULE_TYPE_CASTS(Page);
 DEFINE_STYLE_RULE_TYPE_CASTS(Media);
 DEFINE_STYLE_RULE_TYPE_CASTS(Supports);
 DEFINE_STYLE_RULE_TYPE_CASTS(Viewport);
 DEFINE_STYLE_RULE_TYPE_CASTS(Filter);
 
 } // namespace WebCore
 
 #endif // StyleRule_h