Remove tons of OILPAN.

sky/engine/core/dom/shadow/ShadowRoot.h

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 81 matching lines @@
 public:
     Element* activeElement() const;
 
     ShadowRoot* olderShadowRoot() const { return next(); }
 
     PassRefPtr<Node> cloneNode(bool, ExceptionState&);
     PassRefPtr<Node> cloneNode(ExceptionState& exceptionState) { return cloneNode(true, exceptionState); }
 
     StyleSheetList* styleSheets();
 
-    virtual void trace(Visitor*) override;
-
 private:
     ShadowRoot(Document&);
     virtual ~ShadowRoot();
 
 #if !ENABLE(OILPAN)
     virtual void dispose() override;
 #endif
 
     ShadowRootRareData* ensureShadowRootRareData();
 
@@ skipping 19 matching lines @@
 {
     return adjustedFocusedElement();
 }
 
 DEFINE_NODE_TYPE_CASTS(ShadowRoot, isShadowRoot());
 DEFINE_TYPE_CASTS(ShadowRoot, TreeScope, treeScope, treeScope->rootNode().isShadowRoot(), treeScope.rootNode().isShadowRoot());
 
 } // namespace blink
 
 #endif // ShadowRoot_h