LayoutTest http/tests/security/module-incorrect-mime-types.html is a flaky timeout https://build.webkit.org/results/Apple%20iOS%2010%20Simulator%20Release%20WK2%20(Tests)/r209265%20(2061)/results.html https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2Fsecurity%2Fmodule-incorrect-mime-types.html
Marked as flaky in https://trac.webkit.org/changeset/209448
How about annotating it as Slow? I think this is the same issue to https://bugs.webkit.org/show_bug.cgi?id=164960.