Oilpan: cleanup based on review comments after removal of TreeShared.

Source/core/dom/TreeScope.h

Index: Source/core/dom/TreeScope.h
diff --git a/Source/core/dom/TreeScope.h b/Source/core/dom/TreeScope.h
index 186615a386061f95e0481f17ba9df429e813ac29..78ad612a3f5641bedb92cce12f13f38f8ccb693c 100644
--- a/Source/core/dom/TreeScope.h
+++ b/Source/core/dom/TreeScope.h
@@ -144,7 +144,10 @@ protected:
     TreeScope(Document&);
     virtual ~TreeScope();
 
+#if !ENABLE(OILPAN)
     void destroyTreeScopeData();
+#endif
+
     void setDocument(Document& document) { m_document = &document; }
     void setParentTreeScope(TreeScope&);
 
@@ -159,15 +162,15 @@ private:
 
 #if !ENABLE(OILPAN)
     int refCount() const;
-#endif
 
-#if SECURITY_ASSERT_ENABLED && !ENABLE(OILPAN)
+#if SECURITY_ASSERT_ENABLED
     bool deletionHasBegun();
     void beginDeletion();
 #else
     bool deletionHasBegun() { return false; }
     void beginDeletion() { }
 #endif
+#endif
 
     bool rootNodeHasTreeSharedParent() const;