Smaller vtbls in RenderObject

Source/core/rendering/RenderHTMLCanvas.h

 /*
  * Copyright (C) 2004, 2006, 2007, 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "core/rendering/RenderReplaced.h"
 
 namespace blink {
 
 class HTMLCanvasElement;
 
 class RenderHTMLCanvas final : public RenderReplaced {
 public:
     explicit RenderHTMLCanvas(HTMLCanvasElement*);
 
-    virtual bool isCanvas() const override { return true; }
+    virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectCanvas || RenderReplaced::isOfType(type); }
     virtual LayerType layerTypeRequired() const override;
 
     void canvasSizeChanged();
 
 private:
     virtual const char* renderName() const override { return "RenderHTMLCanvas"; }
     virtual void paintReplaced(PaintInfo&, const LayoutPoint&) override;
     virtual void intrinsicSizeChanged() override { canvasSizeChanged(); }
 
     virtual CompositingReasons additionalCompositingReasons() const override;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderHTMLCanvas, isCanvas());
 
 } // namespace blink
 
 #endif // RenderHTMLCanvas_h