media/modern-media-controls/volume-up-support/volume-up-support.html Test is a flaky timeout according to history on macOS. First occurrence of a timeout was at r265712. History: https://results.webkit.org/?suite=layout-tests&test=media%2Fmodern-media-controls%2Fvolume-up-support%2Fvolume-up-support.html&limit=50000 Diff: Timeout
Test expectation while investigated: https://trac.webkit.org/changeset/265760/webkit
<rdar://problem/67686886>
This test was removed in https://trac.webkit.org/changeset/272375/webkit