radio-button-checkbox-size specifically depends on the fact that when you have a control that has an associated label that's focused, the bounding rectangle of the focused accessible element contains both the label and control. As far as I know this is Mac-specific behavior - or at least, it's certainly not expected on most platforms, so I think the test should be moved to the Mac directory.
Created attachment 180081 [details] Patch
Comment on attachment 180081 [details] Patch Clearing flags on attachment: 180081 Committed r138124: <http://trac.webkit.org/changeset/138124>
All reviewed patches have been landed. Closing bug.