LayoutTest http/tests/media/hls/video-controller-getStartDate.html is flaky <https://build.webkit.org/builders/Apple%20Yosemite%20Debug%20WK2%20(Tests)/builds/12739> <https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2Fmedia%2Fhls%2Fvideo-controller-getStartDate.html>
Times out on Yosemite Debug WK1 and WK2, but most frequently on the Yosemite leaks bot.
Marked as flaky on Yosemite WK1 in http://trac.webkit.org/projects/webkit/changeset/202823