The imported/mozilla/svg/filters/feImage-1.svg layout test is failing on GTK+ since it was added on r177330 (http://trac.webkit.org/changeset/177330). I'm not able to see any difference but the bots are reporting a failure: https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r182144%20%287328%29/imported/mozilla/svg/filters/feImage-1-diffs.html
This test, or group of tests, has been passing for the last 4000 revisions. Closing bug. Gardened in r278519.
<rdar://problem/78896689>