The layout test accessibility/parent-delete.html is failing on platform GTK since it was added on r171347 <http://trac.webkit.org/r171347> The diff is the following: http://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r171347%20%281601%29/accessibility/parent-delete-pretty-diff.html
Updated the GTK TestExpectations on http://trac.webkit.org/changeset/171963 for this failure