Remove tons of OILPAN.

sky/engine/core/dom/shadow/ElementShadow.cpp

Index: sky/engine/core/dom/shadow/ElementShadow.cpp
diff --git a/sky/engine/core/dom/shadow/ElementShadow.cpp b/sky/engine/core/dom/shadow/ElementShadow.cpp
index 459dab70f50aa86cf4e8f13fdf8f65a0c64681f5..28ceafc0b92d339117f51bbee0a128472ab18e6b 100644
--- a/sky/engine/core/dom/shadow/ElementShadow.cpp
+++ b/sky/engine/core/dom/shadow/ElementShadow.cpp
@@ -315,16 +315,4 @@ void ElementShadow::clearDistribution()
     m_nodeToInsertionPoints.clear();
 }
 
-void ElementShadow::trace(Visitor* visitor)
-{
-#if ENABLE(OILPAN)
-    visitor->trace(m_nodeToInsertionPoints);
-    visitor->trace(m_selectFeatures);
-    // Shadow roots are linked with previous and next pointers which are traced.
-    // It is therefore enough to trace one of the shadow roots here and the
-    // rest will be traced from there.
-    visitor->trace(m_shadowRoots.head());
-#endif
-}
-
 } // namespace