The following scrollbar-related tests have started failing after the debug builder became usable again: platform/gtk/scrollbars/overflow-scrollbar-horizontal-wheel-scroll.html scrollbars/scroll-rtl-or-bt-layer.html http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20-%20webkit.org&tests=platform%2Fgtk%2Fscrollbars%2Foverflow-scrollbar-horizontal-wheel-scroll.html%2Cscrollbars%2Fscroll-rtl-or-bt-layer.html
platform/gtk/scrollbars/overflow-scrollbar-horizontal-wheel-scroll.html is now failing on the release bot as well. Unfortunately the bot must have been having problems when this started, as the failure began between r188639-r189090 which is a huge range.
scrollbars/scroll-rtl-or-bt-layer.html has been passing for a long time. Someone forgot to close this bug when removing the expectation.