Smaller vtbls in RenderObject

Source/core/rendering/RenderRubyRun.h

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 50 matching lines @@
     void getOverhang(bool firstLine, RenderObject* startRenderer, RenderObject* endRenderer, int& startOverhang, int& endOverhang) const;
 
     static RenderRubyRun* staticCreateRubyRun(const RenderObject* parentRuby);
 
 protected:
     RenderRubyBase* createRubyBase() const;
 
 private:
     RenderRubyRun();
 
-    virtual bool isRubyRun() const override { return true; }
+    virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectRubyRun || RenderBlockFlow::isOfType(type); }
     virtual const char* renderName() const override { return "RenderRubyRun (anonymous)"; }
     virtual bool createsAnonymousWrapper() const override { return true; }
     virtual void removeLeftoverAnonymousBlock(RenderBlock*) override { }
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderRubyRun, isRubyRun());
 
 } // namespace blink
 
 #endif // RenderRubyRun_h