WPT import https://crrev.com/c/996863 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-flex-basis-content-001a.html [ Failure ]
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-abspos-child-002.html [ Failure ]
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-flex-basis-content-002a.html [ Failure ]
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-flex-basis-content-002b.html [ Failure ]
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-flex-basis-content-001b.html [ Failure ]

This import contains upstream changes from 162e9dda47d694596620b69c5fb23cc7f0f87126 to 384edc99c0e2cac89b0d0c3d405a913fb045bd20:
Handle the case when MANIFEST.json is empty (#10323): https://github.com/w3c/web-platform-tests/commit/384edc99c0e2cac89b0d0c3d405a913fb045bd20
Add tests for wptserve.pipes.ReplacementTokenizer (#10322): https://github.com/w3c/web-platform-tests/commit/f42caef4364c95d933113e650cffa9c84089e3f5
Merge pull request #10327 from mrego/column-gap-normal: https://github.com/w3c/web-platform-tests/commit/37e2fc36c8b8cf123604109f176a83a16378630a
Make URLSearchParamsIterationSource not snapshot: https://github.com/w3c/web-platform-tests/commit/8fa12a570edc5679b9f28b26585a6bd477f0dc16
Remove stylesheet of link element when rel != stylesheet: https://github.com/w3c/web-platform-tests/commit/5c9b2cf251344dd18522bd3fc88742533ce54d5a
Add tests to check that the User-Agent header is set for XHR requests: https://github.com/w3c/web-platform-tests/commit/c6247d29cf2f5e767983783f316080973d956fa3
[css-multicol] column-gap normal is 1em per spec now: https://github.com/w3c/web-platform-tests/commit/fee987632e670876c7468ccd695f41fe90911d6b [affecting this directory]
Out-of-flow descendants may still be part of the flow thread.: https://github.com/w3c/web-platform-tests/commit/297db81150f9a96a0d4582a9fed93f86c8e56a36 [affecting this directory]
CSS: Add WPT tests for basic ::part() functionality.: https://github.com/w3c/web-platform-tests/commit/54f844cf7cdfea12f59979c27781a4a52be335c5 [affecting this directory]
[css-typed-om] Add support for grid properties.: https://github.com/w3c/web-platform-tests/commit/1d216465df83a087ff7be270a17db4a0e380aece [affecting this directory]
Merge pull request #10302 from cvazac/server-timing-parsing-tests: https://github.com/w3c/web-platform-tests/commit/8e19a807e18f603e94aef06d9e2ec30200463615
Sync Mozilla tests as of https://hg.mozilla.org/mozilla-central/rev/071ee904485e21e19ca08456d32bce6825b77a26 . (#10324): https://github.com/w3c/web-platform-tests/commit/8de5d1816566e73f5c446ec20f3937c10aaa706f [affecting this directory]
Web Animations: Fix bug with Document::getAnimations: https://github.com/w3c/web-platform-tests/commit/c148004d6600cc0530d41ec285f2cf80f443052f
RTCPeerConnection.getStats(MediaStreamTrack? selector = null) added.: https://github.com/w3c/web-platform-tests/commit/7ba8056fed36440665a9ff9ee756b7146e9a1777
Sync Mozilla tests as of https://hg.mozilla.org/mozilla-central/rev/c44f60c43432d468639b5fe078420e60c13fd3de . (#10273): https://github.com/w3c/web-platform-tests/commit/400beb3224884391b8d00ceecdfa2250a218e927 [affecting this directory]
Add long timeout to unstable CSP tests, a=testonly on a CLOSED TREE bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1450577 gecko-commit: ad03d48baa47af437fbf6db482aa315071886211 gecko-integration-branch: central gecko-reviewers: testonly: https://github.com/w3c/web-platform-tests/commit/47d7cdf1e41674133b91fd70b911854940072a7b
part 2.  Combine HTMLConstructor and CreateXULOrHTMLElement into a single function. (#10311): https://github.com/w3c/web-platform-tests/commit/9a3fdb412a48f9e73c90eba30173c93cbd426437
Part 4: Add a web-platform test of getBoxQuads on block and flex boxes with auto margins. bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1298008 gecko-commit: c37ba131291e3bc58bc64a5d188a45f28da58f05 gecko-integration-branch: central gecko-reviewers: dholbert: https://github.com/w3c/web-platform-tests/commit/fc538917730759179bab1621375e62b7c4cb0cf4 [affecting this directory]
Fix handling of missing manifest_path in wptcommandline,: https://github.com/w3c/web-platform-tests/commit/904a59bc1d74b8ada29f1739870d49e0598405aa
Fix the logic to do layout stuff after reassigning a slot.: https://github.com/w3c/web-platform-tests/commit/9741b4ed4fbb432551670494869588825a74c7c1 [affecting this directory]
setTimeout/setInterval should silently fail if the worker is shutting down, bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1450416 gecko-commit: b537ebde3ae1393efb0d8ff29ff6838f4b02b914 gecko-integration-branch: central gecko-reviewers: asuth: https://github.com/w3c/web-platform-tests/commit/98fce6ab404b5d328f4362374ba79c9886a22c9e
bluetooth: web: test: Use AllResponsesConsumed: https://github.com/w3c/web-platform-tests/commit/148f026e5178b0b8d77e8f374671c9c5ff1545bf
Update web-platform-tests annotations for webrender on linux. bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1425589 gecko-commit: 6e0605add1f5831268cf99f80b91f78b1f12874b gecko-integration-branch: central gecko-reviewers: jgraham: https://github.com/w3c/web-platform-tests/commit/f1a7713de13c74eec66c9b507a019990a6a7249b
Cache control headers added to png image. bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1433617 gecko-commit: e84c93b3a8ab7234247828edcf7019d8f7393ee7 gecko-integration-branch: central gecko-reviewers: ckerschb: https://github.com/w3c/web-platform-tests/commit/fbaa8f943b3004d227f87f7842874773886f7db2
Remove support for the 'type' parameter to document.open. bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1444872 gecko-commit: 72cdb625f0ce333db35b7e98195d649495e2eb9d gecko-integration-branch: central gecko-reviewers: qdot: https://github.com/w3c/web-platform-tests/commit/6a7101fe1e1bc02adba9003cda6e22c55f24d009
New MIME type parsing tests: https://github.com/w3c/web-platform-tests/commit/ef7fe9a35d808528f92f29b70e4b7ee273c75c85
Fix up the touch-action tests: https://github.com/w3c/web-platform-tests/commit/48df374681de1672f3826915161f6c2e12ec4d59
Simplify assert_throws in two places where error messages were passed: https://github.com/w3c/web-platform-tests/commit/168e0e121c233c19292757f66fd949a444efffc1
clean up same- and cross-origin urls: https://github.com/w3c/web-platform-tests/commit/6fe92079020b85d872209ab1657595d2e34f9a35
[css-typed-om] Support animation and transition properties.: https://github.com/w3c/web-platform-tests/commit/e50234432b0ada957446c990c92db9443a7b78fe [affecting this directory]
Merge branch 'master' of github.com:w3c/web-platform-tests into server-timing-parsing-tests: https://github.com/w3c/web-platform-tests/commit/e7b6f0759f42b858e6a671c98425c961a8370c62
remove load order dependency from consistent assert order: https://github.com/w3c/web-platform-tests/commit/bcbb3c2450fd7665a079b12f477e57f1f767d156