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:
This test, or group of tests, has been passing for the last 4000 revisions. Closing bug. Gardened in r278519.