fast/events/drop-handler-should-not-stop-navigate.html http/tests/navigation/back-twice-without-commit.html
Actually only this one the other tests is a recent regression.
This now passes on the Mac bots: http://build.webkit.org/results/Apple%20MountainLion%20Debug%20WK2%20(Tests)/r153825%20(11521)/results.html Test un-skipped in https://trac.webkit.org/r153842.
Actually, it still fails :(. Regular test results didn't show that because it matched the expectation, but flakiness dashboard shows that it never passed in the last month: <http://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2Fnavigation%2Fback-twice-without-commit.html>
Marked as timing out again in <http://trac.webkit.org/r153910>.