plugins/get-url-notify-with-url-that-fails-to-load.html has been flaky timing out since r191905. Unfortunately this test fails quite rarely, so it will be hard to figure out which commit is really to blame.
The test filed under this bug has been passing consistently in the last 4000 revisions. The test was removed from expectations in r262797. Closing bug.
Committed r262811: <https://trac.webkit.org/changeset/262811>