Layout Test accessibility/ios-simulator/video-elements-ios.html is a flaky timeout on iOS 11 Simulator https://build.webkit.org/results/Apple%20iOS%2011%20Simulator%20Release%20WK2%20(Tests)/r223211%20(476)/results.html https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=accessibility%2Fios-simulator%2Fvideo-elements-ios.html
<rdar://problem/34945986>
Marked as flaky in https://trac.webkit.org/changeset/225245/webkit