Smaller vtbls in RenderObject

Source/core/rendering/RenderRubyText.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 24 matching lines @@
 
 namespace blink {
 
 class RenderRubyText final : public RenderBlockFlow {
 public:
     RenderRubyText(Element*);
     virtual ~RenderRubyText();
 
     virtual const char* renderName() const override { return "RenderRubyText"; }
 
-    virtual bool isRubyText() const override { return true; }
+    virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectRubyText || RenderBlockFlow::isOfType(type); }
 
     virtual bool isChildAllowed(RenderObject*, RenderStyle*) const override;
 
 private:
     virtual bool avoidsFloats() const override;
 
     virtual ETextAlign textAlignmentForLine(bool endsWithSoftBreak) const override;
     virtual void adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const override;
 };
 
 } // namespace blink
 
 #endif // RenderRubyText_h