[windows] Fix checkmark position for WebUI CSS checkbox input elements.

chrome/browser/resources/shared/css/checkbox.css

 /* Copyright (c) 2011 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 input[type='checkbox'] {
   -webkit-box-shadow: inset 0 1px 2px white,
                       0 1px 2px rgba(0, 0, 0, .2);
   -webkit-appearance: none;
   -webkit-margin-start: 0;
   -webkit-margin-end: 3px;
   background: -webkit-linear-gradient(#fafafa, #dcdcdc);
   border-radius: 3px;
   border: 1px solid #a0a0a0;
   display: inline-block;
+  font: inherit;  /* TODO(csilv): investigate why this is required on the
+                     Windows platform. http://crbug.com/105811 */

[dpapad, 2011/12/12 17:53:20]

This broke the checkmark position on Linux (see bug 107217). From the comment it
seems that it is only needed for Windows. If so it should be within

html[os='win'] ..... {
  font: inherit;
}

   height: 16px;
   margin-bottom: 0;
   margin-top: 0;
   position: relative;
   top: 3px;
   vertical-align: baseline;
   width: 16px;
 }
 
 input[type='checkbox']:disabled {
@@ skipping 101 matching lines @@
 
 label:hover > input[type=checkbox]:disabled ~ span,
 label:hover > input[type=radio]:disabled ~ span {
   color: #888;
 }
 
 label:hover > input[type=checkbox]:not(:disabled) ~ span,
 label:hover > input[type=radio]:not(:disabled) ~ span {
   color: #222;
 }