http/tests/xmlhttprequest/overridemimetype-headers-received-state-force-shiftjis.html This test is a flaky timeout on iOS wks according to history. First occurrence of a timeout is at r260030 History: https://results.webkit.org/?suite=layout-tests&test=http%2Ftests%2Fxmlhttprequest%2Foverridemimetype-headers-received-state-force-shiftjis.html&platform=ios&limit=50000 Diff: Timeout
<rdar://problem/66807520>
Test expectation while investigated: https://trac.webkit.org/changeset/265478/webkit