Smaller vtbls in RenderObject

Source/core/rendering/RenderTableCol.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 68 matching lines @@
     const BorderValue& borderAdjoiningCellStartBorder(const RenderTableCell*) const;
     const BorderValue& borderAdjoiningCellEndBorder(const RenderTableCell*) const;
     const BorderValue& borderAdjoiningCellBefore(const RenderTableCell*) const;
     const BorderValue& borderAdjoiningCellAfter(const RenderTableCell*) const;
 
 private:
     virtual RenderObjectChildList* virtualChildren() OVERRIDE { return children(); }
     virtual const RenderObjectChildList* virtualChildren() const OVERRIDE { return children(); }
 
     virtual const char* renderName() const OVERRIDE { return "RenderTableCol"; }
-    virtual bool isRenderTableCol() const OVERRIDE { return true; }
+    virtual bool isOfType(RenderObjectType type) const OVERRIDE { return type == RenderObjectRenderTableCol || RenderBox::isOfType(type); }
     virtual void updateFromElement() OVERRIDE;
     virtual void computePreferredLogicalWidths() OVERRIDE { ASSERT_NOT_REACHED(); }
 
     virtual void insertedIntoTree() OVERRIDE;
     virtual void willBeRemovedFromTree() OVERRIDE;
 
     virtual bool isChildAllowed(RenderObject*, RenderStyle*) const OVERRIDE;
     virtual bool canHaveChildren() const OVERRIDE;
     virtual LayerType layerTypeRequired() const OVERRIDE { return NoLayer; }
 
     virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const OVERRIDE;
     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) OVERRIDE;
 
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
 
     RenderTable* table() const;
 
     RenderObjectChildList m_children;
     unsigned m_span;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTableCol, isRenderTableCol());
 
 }
 
 #endif