Smaller vtbls in RenderObject

Source/core/rendering/RenderTableCaption.h

 /*
  * Copyright (C) 2011 Robert Hogan <robert@roberthogan.net>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 15 matching lines @@
 
 class RenderTable;
 
 class RenderTableCaption final : public RenderBlockFlow {
 public:
     explicit RenderTableCaption(Element*);
     virtual ~RenderTableCaption();
     virtual LayoutUnit containingBlockLogicalWidthForContent() const override;
 
 private:
-    virtual bool isTableCaption() const override { return true; }
+    virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectTableCaption || RenderBlockFlow::isOfType(type); }
 
     virtual void insertedIntoTree() override;
     virtual void willBeRemovedFromTree() override;
 
     RenderTable* table() const;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTableCaption, isTableCaption());
 
 } // namespace blink
 
 #endif // RenderTableCaption_h