Smaller vtbls in RenderObject

Source/core/rendering/RenderDetailsMarker.h

 /*
  * Copyright (C) 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 17 matching lines @@
 class RenderDetailsMarker final : public RenderBlockFlow {
 public:
     RenderDetailsMarker(Element*);
 
     enum Orientation { Up, Down, Left, Right };
 
     Orientation orientation() const;
 
 private:
     virtual const char* renderName() const override { return "RenderDetailsMarker"; }
-    virtual bool isDetailsMarker() const override { return true; }
+    virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectDetailsMarker || RenderBlockFlow::isOfType(type); }
     virtual void paint(PaintInfo&, const LayoutPoint&) override;
 
     bool isOpen() const;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderDetailsMarker, isDetailsMarker());
 
 }
 
 #endif // RenderDetailsMarker_h