Smaller vtbls in RenderObject

Source/core/rendering/RenderTextControlSingleLine.h

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 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.
  *
@@ skipping 31 matching lines @@
 protected:
     virtual void centerContainerIfNeeded(RenderBox*) const { }
     virtual LayoutUnit computeLogicalHeightLimit() const;
     Element* containerElement() const;
     Element* editingViewPortElement() const;
     HTMLInputElement* inputElement() const;
 
 private:
     virtual bool hasControlClip() const OVERRIDE FINAL;
     virtual LayoutRect controlClipRect(const LayoutPoint&) const OVERRIDE FINAL;
-    virtual bool isTextField() const OVERRIDE FINAL { return true; }
+    virtual bool isOfType(RenderObjectType type) const OVERRIDE { return type == RenderObjectTextField || RenderTextControl::isOfType(type); }
 
     virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE;
     virtual void layout() OVERRIDE;
 
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE FINAL;
 
     virtual void autoscroll(const IntPoint&) OVERRIDE FINAL;
 
     // Subclassed to forward to our inner div.
     virtual LayoutUnit scrollLeft() const OVERRIDE FINAL;
@@ skipping 33 matching lines @@
         return orientation == HorizontalScrollbar;
     }
     virtual bool scrollsOverflowX() const OVERRIDE { return hasOverflowClip(); }
     virtual bool scrollsOverflowY() const OVERRIDE { return false; }
     virtual bool hasLineIfEmpty() const OVERRIDE { return true; }
 };
 
 }
 
 #endif