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

Source/core/css/CSSPageRule.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 22 matching lines @@
 namespace WebCore {
 
 CSSPageRule::CSSPageRule(StyleRulePage* pageRule, CSSStyleSheet* parent)
     : CSSRule(parent)
     , m_pageRule(pageRule)
 {
 }
 
 CSSPageRule::~CSSPageRule()
 {
+#if !ENABLE(OILPAN)
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->clearParentRule();
+#endif
 }
 
 CSSStyleDeclaration* CSSPageRule::style() const
 {
     if (!m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_pageRule->mutableProperties(), const_cast<CSSPageRule*>(this));
     return m_propertiesCSSOMWrapper.get();
 }
 
 String CSSPageRule::selectorText() const
@@ skipping 42 matching lines @@
 {
     ASSERT(rule);
     m_pageRule = toStyleRulePage(rule);
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->reattach(m_pageRule->mutableProperties());
 }
 
 void CSSPageRule::trace(Visitor* visitor)
 {
     visitor->trace(m_pageRule);
+    visitor->trace(m_propertiesCSSOMWrapper);
     CSSRule::trace(visitor);
 }
 
 } // namespace WebCore