I confirmed that the test crashes in the crashtest harness without the
patch (although the harness doesn't exit!), whereas it passes with the
patch.
MozReview-Commit-ID: 37S6i1kvw37
--HG--
extra : transplant_source : %9F%A91%90%3F%93%1F%E5%B3%ACHf%8C%BD%BA%C9%12%97%83I