Kris, please take a look over this. Looks to be from https://hg.mozilla.org/mozilla-central/rev/7bfc8b1c626dcf3cf146fafc606fbe0cf8064d1a after Bug 1569832 got into central.
Bug 1570903 Comment 1 Edit History
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Kris, please take a look over this. Looks to be from https://hg.mozilla.org/mozilla-central/rev/2bdc5f8ac30e97669e25172063c1ce8a9cfe16a3 after Bug 1569832 got into central.