Layout test css3/masking/mask-svg-clipped-fragmentId.html is failing since r177494 (http://trac.webkit.org/changeset/177494). The diff is the following https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r180999%20%286665%29/css3/masking/mask-svg-clipped-fragmentId-diffs.html
r177494 was reverted on r186391 And this test removed