The fast/text/international/synthesized-italic-vertical.html layout test is failing on GTK+ since revision r183680 (http://trac.webkit.org/changeset/183680). This revision updates the expected result for GTK+ platform. The diffs are the following: https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r183744%20%288238%29/fast/text/international/synthesized-italic-vertical-diffs.html
*** This bug has been marked as a duplicate of bug 144612 ***