Remove two failure entries for passing layout tests

tables/mozilla/bugs/bug2973.html
fast/scroll-snap/snaps-after-scrollbar-scrolling.html

Flakiness dashboard:
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=tables%2Fmozilla%2Fbugs%2Fbug2973.html%20fast%2Fscroll-snap%2Fsnaps-after-scrollbar-scrolling.html

TBR=wangxianzhu@chromium.org

Bug: 902591,864887
Change-Id: Ic5d2cdc9fcb18c00bed18e4babd8c53a9f190eaf
Reviewed-on: https://chromium-review.googlesource.com/c/1407771
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622224}
1 file changed