Modify platform/mac-wk2/plugins/muted-state.html to set the page into a known good state (unmuted) before the test starts now that http://trac.webkit.org/changeset/207561 as landed.
Marked test as failing to unblock EWS in http://trac.webkit.org/projects/webkit/changeset/207574
Jer, would you be willing to do this now?