Bug 1644555 [wpt PR 24069] - De-flake cross-domain-iframe.sub.html, a=testonly

Bug 1644555 [wpt PR 24069] - De-flake cross-domain-iframe.sub.html, a=testonly

Automatic update from web-platform-tests
De-flake cross-domain-iframe.sub.html

If this doesn't deflake the test, then I suspect that there is an issue
on some bots with the cross-origin domain name being resolved. On my
machine, the origin of the iframe was www1.web-platform.test:8001, and
if the machine doesn't have the custom wpt domains configured, then the
test will produce a white screen just like the flaky failures.

Bug: 1091270
Change-Id: I4db90275632166b01a53fc6a7fa54c006c4c14d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2236740
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776976}

--

wpt-commits: d46b0e393b013e0c43339241e381cc5f645680bf
wpt-pr: 24069