Smaller vtbls in RenderObject

Source/core/rendering/RenderListItem.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 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 40 matching lines @@
     void updateListMarkerNumbers();
 
     static void updateItemValuesForOrderedList(const HTMLOListElement*);
     static unsigned itemCountForOrderedList(const HTMLOListElement*);
 
     bool isEmpty() const;
 
 private:
     virtual const char* renderName() const override { return "RenderListItem"; }
 
-    virtual bool isListItem() const override { return true; }
+    virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectListItem || RenderBlockFlow::isOfType(type); }
 
     virtual void willBeDestroyed() override;
 
     virtual void insertedIntoTree() override;
     virtual void willBeRemovedFromTree() override;
 
     virtual void paint(PaintInfo&, const LayoutPoint&) override;
 
     virtual void layout() override;
 
@@ skipping 18 matching lines @@
     bool m_hasExplicitValue : 1;
     mutable bool m_isValueUpToDate : 1;
     bool m_notInList : 1;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderListItem, isListItem());
 
 } // namespace blink
 
 #endif // RenderListItem_h