Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/core/dom/shadow/ShadowRoot.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 50 matching lines @@
     , m_descendantInsertionPointsIsValid(false)
 {
     ScriptWrappable::init(this);
 }
 
 ShadowRoot::~ShadowRoot()
 {
     ASSERT(!m_prev);
     ASSERT(!m_next);
 
+#if !ENABLE(OILPAN)
     if (m_shadowRootRareData && m_shadowRootRareData->styleSheets())
         m_shadowRootRareData->styleSheets()->detachFromDocument();
 
     document().styleEngine()->didRemoveShadowRoot(this);
+#endif
 
     // We cannot let ContainerNode destructor call willBeDeletedFromDocument()
     // for this ShadowRoot instance because TreeScope destructor
     // clears Node::m_treeScope thus ContainerNode is no longer able
     // to access it Document reference after that.
     willBeDeletedFromDocument();
 
     // We must remove all of our children first before the TreeScope destructor
     // runs so we don't go through TreeScopeAdopter for each child with a
     // destructed tree scope in each descendant.
@@ skipping 138 matching lines @@
     ASSERT(hasScopedHTMLStyleChild() && m_numberOfStyles > 0);
     --m_numberOfStyles;
     setHasScopedHTMLStyleChild(m_numberOfStyles > 0);
 }
 
 ShadowRootRareData* ShadowRoot::ensureShadowRootRareData()
 {
     if (m_shadowRootRareData)
         return m_shadowRootRareData.get();
 
-    m_shadowRootRareData = adoptPtr(new ShadowRootRareData);
+    m_shadowRootRareData = adoptPtrWillBeNoop(new ShadowRootRareData);
     return m_shadowRootRareData.get();
 }
 
 bool ShadowRoot::containsShadowElements() const
 {
     return m_shadowRootRareData ? m_shadowRootRareData->containsShadowElements() : 0;
 }
 
 bool ShadowRoot::containsContentElements() const
 {
@@ skipping 82 matching lines @@
 }
 
 StyleSheetList* ShadowRoot::styleSheets()
 {
     if (!ensureShadowRootRareData()->styleSheets())
         m_shadowRootRareData->setStyleSheets(StyleSheetList::create(this));
 
     return m_shadowRootRareData->styleSheets();
 }
 
+void ShadowRoot::trace(Visitor* visitor)
+{
+    visitor->trace(m_shadowRootRareData);
+    TreeScope::trace(visitor);
+    DocumentFragment::trace(visitor);
 }
+
+}