Does not fail in-browser, or in the WK1 test runner.
This also happens on WK1 occasionally: http://build.webkit.org/results/Apple%20Lion%20Release%20WK2%20(Tests)/r154377%20(12211)/results.html http://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=media%2Fvideo-played-collapse.html
Updated the test expectation in http://trac.webkit.org/changeset/154437.