Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/core/dom/shadow/ShadowRoot.cpp

Index: Source/core/dom/shadow/ShadowRoot.cpp
diff --git a/Source/core/dom/shadow/ShadowRoot.cpp b/Source/core/dom/shadow/ShadowRoot.cpp
index e7dcc984865024fc57d1a6ff573ea073cf93abaa..990c5891bd376adc344d9773ea0a3ee2dc3d5caa 100644
--- a/Source/core/dom/shadow/ShadowRoot.cpp
+++ b/Source/core/dom/shadow/ShadowRoot.cpp
@@ -68,10 +68,12 @@ 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
@@ -230,7 +232,7 @@ ShadowRootRareData* ShadowRoot::ensureShadowRootRareData()
     if (m_shadowRootRareData)
         return m_shadowRootRareData.get();
 
-    m_shadowRootRareData = adoptPtr(new ShadowRootRareData);
+    m_shadowRootRareData = adoptPtrWillBeNoop(new ShadowRootRareData);
     return m_shadowRootRareData.get();
 }
 
@@ -333,4 +335,11 @@ StyleSheetList* ShadowRoot::styleSheets()
     return m_shadowRootRareData->styleSheets();
 }
 
+void ShadowRoot::trace(Visitor* visitor)
+{
+    visitor->trace(m_shadowRootRareData);
+    TreeScope::trace(visitor);
+    DocumentFragment::trace(visitor);
+}
+
 }