Bug 259134

Description:
imported/w3c/web-platform-tests/screen-orientation/unlock.html

The first failure I saw on the dashboard was at 257554@main, where it began to flaky fail from consistently passing.    

------------- BUG AUDIT TRAIL -------------
257462@main --> Passed
257507@main --> Passed
257550@main --> Passed
257553@main --> Passed
257554@main --> Failed
257555@main --> Failed
------------- BUG AUDIT TRAIL END -------------

The test later at 265284@main goes from flaky failing to consistently failing.

[1/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)
[2/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)
[3/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)
[4/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)
[5/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)
[6/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)
[7/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)
[8/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)
[9/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)
[10/10] imported/w3c/web-platform-tests/screen-orientation/unlock.html failed unexpectedly (text diff)

Regressions: Unexpected text-only failures (1)
  imported/w3c/web-platform-tests/screen-orientation/unlock.html [ Failure ]

------------- BUG AUDIT TRAIL -------------
265284@main --> Failed
265283@main --> Flaky Failed
------------- BUG AUDIT TRAIL END -------------

This issue can be bisected to 265284@main using command:
run-webkit-tests --release --iterations=1 --force --ios-simulator  imported/w3c/web-platform-tests/screen-orientation/unlock.html


History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fscreen-orientation%2Funlock.html&platform=ios&recent=false

Diff:
@@ -4,5 +4,5 @@
 PASS unlock() returns a void value
 PASS unlock() doesn't throw when there is no lock with fullscreen
 PASS unlock() aborts a pending lock request
-FAIL unlock() aborts a pending lock request across documents promise_rejects_dom: function "function () { throw e }" threw object "SecurityError: Locking the screen orientation is only allowed when in fullscreen" that is not a DOMException AbortError: property "code" is equal to 18, expected 20
+FAIL unlock() aborts a pending lock request across documents promise_test: Unhandled rejection with value: object "TypeError: Type error"