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

Source/core/rendering/RenderThemeChromiumMac.mm

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
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 bool RenderThemeChromiumMac::paintMediaFullscreenButton(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
 {
     return RenderMediaControlsChromium::paintMediaControlsPart(MediaEnterFullscreenButton, object, paintInfo, rect);
 }
 
 bool RenderThemeChromiumMac::paintMediaToggleClosedCaptionsButton(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
 {
     return RenderMediaControlsChromium::paintMediaControlsPart(MediaShowClosedCaptionsButton, object, paintInfo, rect);
 }
 
+bool RenderThemeChromiumMac::shouldUseFallbackTheme(RenderStyle* style) const
+{
+    ControlPart part = style->appearance();
+    if (part == CheckboxPart || part == RadioPart)
+        return style->effectiveZoom() != 1;
+    return false;
+}
+
 } // namespace WebCore