Move CSSRuleList to the garbage collected heap

Source/core/css/CSSRuleList.cpp

 /**
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2012 Apple Computer, Inc.
  *
  * 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 17 matching lines @@
 
 CSSRuleList::CSSRuleList()
 {
 }
 
 CSSRuleList::~CSSRuleList()
 {
 }
 
 StaticCSSRuleList::StaticCSSRuleList()
+#if !ENABLE(OILPAN)
     : m_refCount(1)
+#endif
 {
 }
 
 StaticCSSRuleList::~StaticCSSRuleList()
 {
 }
 
+#if !ENABLE(OILPAN)
 void StaticCSSRuleList::deref()
 {
     ASSERT(m_refCount);
     if (!--m_refCount)
         delete this;
 }
+#endif
+
+void StaticCSSRuleList::trace(Visitor* visitor)
+{
+    visitor->trace(m_rules);
+}
+
 
 } // namespace WebCore