Remove tons of OILPAN.

sky/engine/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 415 matching lines @@
 {
     for (Element* element = ElementTraversal::firstWithin(rootNode()); element; element = ElementTraversal::next(*element)) {
         for (ShadowRoot* root = element->youngestShadowRoot(); root; root = root->olderShadowRoot())
             root->setNeedsStyleRecalcForViewportUnits();
         RenderStyle* style = element->renderStyle();
         if (style && style->hasViewportUnits())
             element->setNeedsStyleRecalc(LocalStyleChange);
     }
 }
 
-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