Smaller vtbls in RenderObject

Source/core/rendering/RenderFrame.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2006, 2009 Apple 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 20 matching lines @@
 class HTMLFrameElement;
 
 class RenderFrame FINAL : public RenderPart {
 public:
     explicit RenderFrame(HTMLFrameElement*);
 
     FrameEdgeInfo edgeInfo() const;
 
 private:
     virtual const char* renderName() const OVERRIDE { return "RenderFrame"; }
-    virtual bool isFrame() const OVERRIDE { return true; }
+    virtual bool isOfType(RenderObjectType type) const OVERRIDE { return type == RenderObjectFrame || RenderPart::isOfType(type); }
 
     virtual void updateFromElement() OVERRIDE;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFrame, isFrame());
 
 } // namespace blink
 
 #endif // RenderFrame_h