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

Source/core/rendering/RenderThemeChromiumMac.h

 /*
  * This file is part of the theme implementation for form controls in WebCore.
  *
  * Copyright (C) 2005 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 184 matching lines @@
     virtual String formatMediaControlsTime(float time) const;
     virtual String formatMediaControlsCurrentTime(float currentTime, float duration) const;
     virtual bool paintMediaFullscreenButton(RenderObject*, const PaintInfo&, const IntRect&);
     virtual bool paintMediaToggleClosedCaptionsButton(RenderObject*, const PaintInfo&, const IntRect&);
 
     // Controls color values returned from platformFocusRingColor(). systemColor() will be used when false.
     bool usesTestModeFocusRingColor() const;
     // A view associated to the contained document. Subclasses may not have such a view and return a fake.
     NSView* documentViewFor(RenderObject*) const;
 
+    virtual bool shouldUseFallbackTheme(RenderStyle*) const OVERRIDE;
+
 private:
     virtual Color disabledTextColor(const Color& textColor, const Color&) const OVERRIDE { return textColor; }
     virtual void updateActiveState(NSCell*, const RenderObject*);
     virtual String extraDefaultStyleSheet();
     virtual bool shouldShowPlaceholderWhenFocused() const OVERRIDE;
 
     mutable RetainPtr<NSPopUpButtonCell> m_popupButton;
     mutable RetainPtr<NSSearchFieldCell> m_search;
     mutable RetainPtr<NSMenu> m_searchMenuTemplate;
     mutable RetainPtr<NSSliderCell> m_sliderThumbHorizontal;
     mutable RetainPtr<NSSliderCell> m_sliderThumbVertical;
     mutable RetainPtr<NSLevelIndicatorCell> m_levelIndicator;
     mutable RetainPtr<NSTextFieldCell> m_textField;
 
     bool m_isSliderThumbHorizontalPressed;
     bool m_isSliderThumbVerticalPressed;
 
     mutable HashMap<int, RGBA32> m_systemColorCache;
 
     RetainPtr<WebCoreRenderThemeNotificationObserver> m_notificationObserver;
 };
 
 } // namespace WebCore
 
 #endif // RenderThemeChromiumMac_h