Remove more oilpan.

sky/engine/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 124 matching lines @@
     bool draggable;
 };
 
 typedef WTF::HashMap<const RenderLayer*, Vector<LayoutRect> > LayerHitTestRects;
 
 #ifndef NDEBUG
 const int showTreeCharacterOffset = 39;
 #endif
 
 // Base class for all rendering tree objects.
-class RenderObject : public DummyBase<RenderObject>, public ImageResourceClient {
+class RenderObject : public ImageResourceClient {
     friend class RenderBlock;
     friend class RenderBlockFlow;
     friend class RenderLayerScrollableArea; // For setParent.
     friend class RenderObjectChildList;
     WTF_MAKE_NONCOPYABLE(RenderObject);
 public:
     // Anonymous objects should pass the document as their node, and they will then automatically be
     // marked as anonymous in the constructor.
     explicit RenderObject(Node*);
     virtual ~RenderObject();
@@ skipping 1165 matching lines @@
 void showTree(const blink::RenderObject*);
 void showLineTree(const blink::RenderObject*);
 void showRenderTree(const blink::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const blink::RenderObject* object1, const blink::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h