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

Source/core/css/CSSViewportRule.cpp

 /*
  * Copyright (C) 2012 Intel Corporation. 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 28 matching lines @@
 namespace WebCore {
 
 CSSViewportRule::CSSViewportRule(StyleRuleViewport* viewportRule, CSSStyleSheet* sheet)
     : CSSRule(sheet)
     , m_viewportRule(viewportRule)
 {
 }
 
 CSSViewportRule::~CSSViewportRule()
 {
+#if !ENABLE(OILPAN)
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->clearParentRule();
+#endif
 }
 
 CSSStyleDeclaration* CSSViewportRule::style() const
 {
     if (!m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_viewportRule->mutableProperties(), const_cast<CSSViewportRule*>(this));
 
     return m_propertiesCSSOMWrapper.get();
 }
 
@@ skipping 16 matching lines @@
 {
     ASSERT(rule);
     m_viewportRule = toStyleRuleViewport(rule);
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->reattach(m_viewportRule->mutableProperties());
 }
 
 void CSSViewportRule::trace(Visitor* visitor)
 {
     visitor->trace(m_viewportRule);
+    visitor->trace(m_propertiesCSSOMWrapper);
     CSSRule::trace(visitor);
 }
 
 } // namespace WebCore