Layout test inspector/css/pseudo-element-matches.html timeouts on platform GTK since it was added on r175758 <http://trac.webkit.org/r175758>
And layout test inspector/css/selector-specificity.html is flaky since r175758 also: inspector/css/selector-specificity.html [ Timeout Pass ]
Marked accordingly on the GTK expectations on https://trac.webkit.org/r176922
This test has been passing since [r2720555-r272061]. Removed it from TestExpectations in r276004. Closing bug.