<https://webkit.org/b/118754> AX: aria-required.html needs to test @required vs @aria-required mismatch reconciliation

Patch by James Craig <james@cookiecrook.com> on 2013-08-19
Reviewed by Chris Fleizach.

More thorough testing of @required and @aria-required, especially regarding conflict resolution.
Found https://webkit.org/b/119988 as a result of the updated test.

* accessibility/aria-required-expected.txt:
* accessibility/aria-required.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154309 268f45cc-cd09-0410-ab3c-d52691b4dbfc