Oilpan: Move CSSStyleDeclaration and subclasses to the heap using transistion types.

Source/core/css/CSSStyleRule.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 29 matching lines @@
 }
 
 CSSStyleRule::CSSStyleRule(StyleRule* styleRule, CSSStyleSheet* parent)
     : CSSRule(parent)
     , m_styleRule(styleRule)
 {
 }
 
 CSSStyleRule::~CSSStyleRule()
 {
+#if !ENABLE(OILPAN)
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->clearParentRule();
-
+#endif
     if (hasCachedSelectorText()) {
         selectorTextCache().remove(this);
         setHasCachedSelectorText(false);
     }
 }
 
 CSSStyleDeclaration* CSSStyleRule::style() const
 {
     if (!m_propertiesCSSOMWrapper) {
         m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_styleRule->mutableProperties(), const_cast<CSSStyleRule*>(this));
@@ skipping 62 matching lines @@
 {
     ASSERT(rule);
     m_styleRule = toStyleRule(rule);
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->reattach(m_styleRule->mutableProperties());
 }
 
 void CSSStyleRule::trace(Visitor* visitor)
 {
     visitor->trace(m_styleRule);
+    visitor->trace(m_propertiesCSSOMWrapper);
     CSSRule::trace(visitor);
 }
 
 } // namespace WebCore