The following layout test is flaky on platform GTK.
When it fails, the diff is the following: http://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r171262%20%281539%29/animations/animation-welcome-safari-pretty-diff.html
The test(s) filed under this bug have been consistently passing for the last 4000 revisions. Marking bug as fixed.
Committed r263254: <https://trac.webkit.org/changeset/263254>