Move CSSRuleList to the garbage collected heap

Source/core/css/ElementRuleCollector.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 84 matching lines @@
 
     void setMode(SelectorChecker::Mode mode) { m_mode = mode; }
     void setPseudoStyleRequest(const PseudoStyleRequest& request) { m_pseudoStyleRequest = request; }
     void setSameOriginOnly(bool f) { m_sameOriginOnly = f; }
 
     void setMatchingUARules(bool matchingUARules) { m_matchingUARules = matchingUARules; }
     bool hasAnyMatchingRules(RuleSet*);
 
     MatchResult& matchedResult();
     PassRefPtr<StyleRuleList> matchedStyleRuleList();
-    PassRefPtr<CSSRuleList> matchedCSSRuleList();
+    PassRefPtrWillBeRawPtr<CSSRuleList> matchedCSSRuleList();
 
     void collectMatchingRules(const MatchRequest&, RuleRange&, SelectorChecker::BehaviorAtBoundary = SelectorChecker::DoesNotCrossBoundary, CascadeScope = ignoreCascadeScope, CascadeOrder = ignoreCascadeOrder);
     void sortAndTransferMatchedRules();
     void clearMatchedRules();
     void addElementStyleProperties(const StylePropertySet*, bool isCacheable = true);
 
     unsigned lastMatchedRulesPosition() const { return m_matchedRules ? m_matchedRules->size() : 0; }
     void sortMatchedRulesFrom(unsigned position);
     void sortAndTransferMatchedRulesWithOnlySortBySpecificity();
 
@@ skipping 30 matching lines @@
 
     PseudoStyleRequest m_pseudoStyleRequest;
     SelectorChecker::Mode m_mode;
     bool m_canUseFastReject;
     bool m_sameOriginOnly;
     bool m_matchingUARules;
 
     OwnPtr<Vector<MatchedRule, 32> > m_matchedRules;
 
     // Output.
-    RefPtr<StaticCSSRuleList> m_cssRuleList;
+    RefPtrWillBeMember<StaticCSSRuleList> m_cssRuleList;
     RefPtr<StyleRuleList> m_styleRuleList;
     MatchResult m_result;
 };
 
 } // namespace WebCore
 
 #endif // ElementRuleCollector_h