Skip accessibility/menu-list-sends-change-notification.html on Mac.
https://bugs.webkit.org/show_bug.cgi?id=69970

Reviewed by Simon Fraser.

* platform/mac/Skipped:


git-svn-id: svn://svn.chromium.org/blink/trunk@97315 bbb929c8-8fbe-4397-9dbb-9b2b20218538