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

BUG=105811
TEST=Verify checkboxes render correctly in options window with any font size selected.
Review URL: http://codereview.chromium.org/8879035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113885 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -13,6 +13,8 @@ input[type='checkbox'] {
   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 */
   height: 16px;
   margin-bottom: 0;
   margin-top: 0;