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

Source/core/css/StyleRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2012 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 345 matching lines @@
 {
     m_childRules.remove(index);
 }
 
 void StyleRuleGroup::traceAfterDispatch(Visitor* visitor)
 {
     visitor->trace(m_childRules);
     StyleRuleBase::traceAfterDispatch(visitor);
 }
 
-StyleRuleMedia::StyleRuleMedia(PassRefPtr<MediaQuerySet> media, WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase> >& adoptRules)
+StyleRuleMedia::StyleRuleMedia(PassRefPtrWillBeRawPtr<MediaQuerySet> media, WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase> >& adoptRules)
     : StyleRuleGroup(Media, adoptRules)
     , m_mediaQueries(media)
 {
 }
 
 StyleRuleMedia::StyleRuleMedia(const StyleRuleMedia& o)
     : StyleRuleGroup(o)
 {
     if (o.m_mediaQueries)
         m_mediaQueries = o.m_mediaQueries->copy();
 }
 
+void StyleRuleMedia::traceAfterDispatch(Visitor* visitor)
+{
+    visitor->trace(m_mediaQueries);
+    StyleRuleGroup::traceAfterDispatch(visitor);
+}
+
 StyleRuleSupports::StyleRuleSupports(const String& conditionText, bool conditionIsSupported, WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase> >& adoptRules)
     : StyleRuleGroup(Supports, adoptRules)
     , m_conditionText(conditionText)
     , m_conditionIsSupported(conditionIsSupported)
 {
 }
 
 StyleRuleSupports::StyleRuleSupports(const StyleRuleSupports& o)
     : StyleRuleGroup(o)
     , m_conditionText(o.m_conditionText)
@@ skipping 51 matching lines @@
         m_properties = m_properties->mutableCopy();
     return *toMutableStylePropertySet(m_properties);
 }
 
 void StyleRuleFilter::setProperties(PassRefPtr<StylePropertySet> properties)
 {
     m_properties = properties;
 }
 
 } // namespace WebCore