Move CSSRuleList to the garbage collected heap

Source/core/css/CSSGroupingRule.cpp

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 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
@@ skipping 121 matching lines @@
     ASSERT(m_childRuleCSSOMWrappers.size() == m_groupRule->childRules().size());
     RefPtrWillBeMember<CSSRule>& rule = m_childRuleCSSOMWrappers[index];
     if (!rule)
         rule = m_groupRule->childRules()[index]->createCSSOMWrapper(const_cast<CSSGroupingRule*>(this));
     return rule.get();
 }
 
 CSSRuleList* CSSGroupingRule::cssRules() const
 {
     if (!m_ruleListCSSOMWrapper)
-        m_ruleListCSSOMWrapper = adoptPtr(new LiveCSSRuleList<CSSGroupingRule>(const_cast<CSSGroupingRule*>(this)));
+        m_ruleListCSSOMWrapper = LiveCSSRuleList<CSSGroupingRule>::create(const_cast<CSSGroupingRule*>(this));
     return m_ruleListCSSOMWrapper.get();
 }
 
 void CSSGroupingRule::reattach(StyleRuleBase* rule)
 {
     ASSERT(rule);
     m_groupRule = static_cast<StyleRuleGroup*>(rule);
     for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
         if (m_childRuleCSSOMWrappers[i])
             m_childRuleCSSOMWrappers[i]->reattach(m_groupRule->childRules()[i].get());
     }
 }
 
 void CSSGroupingRule::trace(Visitor* visitor)
 {
     CSSRule::trace(visitor);
 #if ENABLE(OILPAN)
     visitor->trace(m_childRuleCSSOMWrappers);
 #endif
     visitor->trace(m_groupRule);
+    visitor->trace(m_ruleListCSSOMWrapper);
 }
 
 } // namespace WebCore