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

Source/core/rendering/RenderThemeChromiumWin.cpp

 /*
  * This file is part of the WebKit project.
  *
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2008, 2009 Google, Inc.
  * Copyright (C) 2009 Kenneth Rohde Christiansen
  *
  * 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
@@ skipping 636 matching lines @@
     WebKit::WebCanvas* canvas = painter.context()->canvas();
     WebKit::Platform::current()->themeEngine()->paintProgressBar(canvas, WebKit::WebRect(r), WebKit::WebRect(valueRect), renderProgress->isDeterminate(), animatedSeconds);
     return false;
 }
 
 bool RenderThemeChromiumWin::shouldOpenPickerWithF4Key() const
 {
     return true;
 }
 
+bool RenderThemeChromiumWin::shouldUseFallbackTheme(RenderStyle* style) const
+{
+    ControlPart part = style->appearance();
+    if (part == CheckboxPart || part == RadioPart)
+        return style->effectiveZoom() != 1;
+    return false;
+}
+
 } // namespace WebCore