WPT import https://crrev.com/c/1136590 introduced new failures in external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox:

List of new failures:
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-column-row-gap-003.html [ Failure ]

This import contains upstream changes from 9e4a93afa661c4a6ecb39ce810fcc77d73cd6405 to 09b1e552b10c3d0614148b24e40de6c007848bfa:
Sync Mozilla tests as of https://hg.mozilla.org/mozilla-central/rev/e951f4ad123aa87d1d392c286db14cabb41a8560 . (#11966): https://github.com/web-platform-tests/wpt/commit/09b1e552b10c3d0614148b24e40de6c007848bfa [affecting this directory]
location.assign() and location.replace() changed to accept TrustedTypes: https://github.com/web-platform-tests/wpt/commit/d886715e456fb9a2e23e310ceaf8f9edc38f24b2