Enable proper zooming of checkbox and radio button on Win and Mac.

Source/core/rendering/RenderThemeChromiumWin.h

 /*
  * This file is part of the WebKit project.
  *
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * 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 71 matching lines @@
 
     virtual double animationRepeatIntervalForProgressBar(RenderProgress*) const OVERRIDE;
     virtual double animationDurationForProgressBar(RenderProgress*) const OVERRIDE;
     virtual void adjustProgressBarStyle(StyleResolver*, RenderStyle*, Element*) const OVERRIDE;
     virtual bool paintProgressBar(RenderObject*, const PaintInfo&, const IntRect&) OVERRIDE;
 
     virtual bool shouldOpenPickerWithF4Key() const OVERRIDE;
 
 protected:
     virtual double caretBlinkIntervalInternal() const OVERRIDE;
+    virtual bool shouldUseFallbackTheme(RenderStyle*) const OVERRIDE;
 
 private:
     enum ControlSubPart {
         None,
         SpinButtonDown,
         SpinButtonUp,
     };
 
     RenderThemeChromiumWin() { }
     virtual ~RenderThemeChromiumWin() { }
 
     unsigned determineState(RenderObject*, ControlSubPart = None);
     unsigned determineSliderThumbState(RenderObject*);
     unsigned determineClassicState(RenderObject*, ControlSubPart = None);
 
     ThemeData getThemeData(RenderObject*, ControlSubPart = None);
 
     bool paintTextFieldInternal(RenderObject*, const PaintInfo&, const IntRect&, bool);
 };
 
 } // namespace WebCore
 
 #endif