@raulgurzau @moz-gfx
Backed out changeset 6493da33ecac (bug 1589669) for failing at test_b…
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…ug1277814.html on a CLOSED TREE.

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/691a752d9319c85e73c4e62d577e9ba95f656407