Remove tons of OILPAN.

sky/engine/core/dom/TreeScope.cpp

Index: sky/engine/core/dom/TreeScope.cpp
diff --git a/sky/engine/core/dom/TreeScope.cpp b/sky/engine/core/dom/TreeScope.cpp
index c34be1567dbb97e17cf277123c60cc4cb459b30d..de3f4292abda3ec0989539a94d154e199b1ff4ca 100644
--- a/sky/engine/core/dom/TreeScope.cpp
+++ b/sky/engine/core/dom/TreeScope.cpp
@@ -433,16 +433,4 @@ void TreeScope::setNeedsStyleRecalcForViewportUnits()
     }
 }
 
-void TreeScope::trace(Visitor* visitor)
-{
-    visitor->trace(m_rootNode);
-    visitor->trace(m_document);
-    visitor->trace(m_parentTreeScope);
-    visitor->trace(m_selection);
-    visitor->trace(m_elementsById);
-    visitor->trace(m_imageMapsByName);
-    visitor->trace(m_labelsByForAttribute);
-    visitor->trace(m_scopedStyleResolver);
-}
-
 } // namespace blink