Backed in beta for landing with the wrong bug number. Relanded the patch with the correct bug number.
Bug 1574553 Comment 9 Edit History
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Backed in beta for landing with the wrong bug number. Relanded the patch with the correct bug number. https://hg.mozilla.org/releases/mozilla-beta/rev/d3992ddf68c7168b579cac1a63685f5a496ddf71