WPT import https://crrev.com/c/1168738 introduced new failures in external/wpt/background-fetch:

List of new failures:
external/wpt/background-fetch/idlharness.https.any.html new failing tests: https://crrev.com/c/1168738/4/third_party/WebKit/LayoutTests/external/wpt/background-fetch/idlharness.https.any-expected.txt
external/wpt/background-fetch/idlharness.https.any.worker.html new failing tests: https://crrev.com/c/1168738/4/third_party/WebKit/LayoutTests/external/wpt/background-fetch/idlharness.https.any.worker-expected.txt
external/wpt/background-fetch/idlharness.https.any.sharedworker.html new failing tests: https://crrev.com/c/1168738/4/third_party/WebKit/LayoutTests/external/wpt/background-fetch/idlharness.https.any.sharedworker-expected.txt

This import contains upstream changes from 5a3a984492dcd1b1586576790922baf0a208dfb5 to f69ed366b8c028c882a4fb582b20d6982577c00f:
Check [NewObject] on show(), use webdriver (#11775): https://github.com/web-platform-tests/wpt/commit/f69ed366b8c028c882a4fb582b20d6982577c00f
HTML: test 'face' and 'size' attribute on <font> element: https://github.com/web-platform-tests/wpt/commit/b7fa1d84d8d38671049d805ca1b7c025c12b0fd8
Add RTCIceTransport IDL + binding skeleton: https://github.com/web-platform-tests/wpt/commit/c4bd959ae80333a356e43c651ea26ee4baf017e2
[IntersectionObserver] Fix initial notifications for non-zero threshold: https://github.com/web-platform-tests/wpt/commit/a6abe150c4901fdb461fc853f3b067ac495ce8f3
MSE: Make changeType-play layout tests' audio mime-type be audio-specific: https://github.com/web-platform-tests/wpt/commit/531bf4a9a5fd6e7812a40a8df1a6c32b4ba748e3
Hide URL.createObjectURL from ServiceWorker: https://github.com/web-platform-tests/wpt/commit/3941f3cdfb8d128f5e150734f125942fa60e689f
Rename idlharness tests for [SecureContext] APIs to .https. (#12353): https://github.com/web-platform-tests/wpt/commit/1e79f6d25a79ca5e5d47bc3696904c303d173033 [affecting this directory]
patch 2 - Send nsChangeHint_UpdateContainingBlock when containing block-ness changes due to one property change, while another property that might trigger containing block-ness doesn't do so because of the frame type.: https://github.com/web-platform-tests/wpt/commit/68b48c5da7a543b0fa5a7081f9e3c15bf96f18df
patch 1 - Make inline frames be abs-pos containing blocks for reasons other than being relatively positioned.: https://github.com/web-platform-tests/wpt/commit/39109be81d24b1782fb05ca4ea9da502d402f8d9
DOM: test for the absence of XMLDocument.prototype.load: https://github.com/web-platform-tests/wpt/commit/580e5b52e20a9a2b4f63e9d33e9c4b039c68ce08
DOM: add a test for getRootNode({composed:true}): https://github.com/web-platform-tests/wpt/commit/315ad5300562f570b3fdffcfc8041dbd5024b592
[css-grid] Update grid-layout-properties.html to new behavior: https://github.com/web-platform-tests/wpt/commit/d26f049f434b58e97b121e560fd90d0b9c80d454
Add tests for dynamic changes to base urls (#12313): https://github.com/web-platform-tests/wpt/commit/7d91339d2e83b8f7f7649dfcd33a29a581421ebd
Ensure that in-repo files that match gitignore rules are synced.: https://github.com/web-platform-tests/wpt/commit/157d21f4b647ca4ddcdb0a62d304dcaa43a9c265
Fix worklet referrer tests to match spec: https://github.com/web-platform-tests/wpt/commit/b315ee9209a6039e96412520163764b3ae360605
Update nokogiri version: https://github.com/web-platform-tests/wpt/commit/6d9f42cb8c5b91915b70e1957273617b84dda0ae
Add WPT tests for inert: https://github.com/web-platform-tests/wpt/commit/1048171f1150d1e495960ac2ea5f9a40cee032e6
Fix module worker referrer tests: https://github.com/web-platform-tests/wpt/commit/140efeeb75c11af8feb410fa9dcef8aa62c60159
Have the second OptionallyBreak actually make sense.: https://github.com/web-platform-tests/wpt/commit/87962ab4acbf999d184cb00e55e941cf63ab362c
Don't re-attach ::first-letter during style recalc.: https://github.com/web-platform-tests/wpt/commit/3dd27ccc5876d3ad06ccce491da49b477d623621
Don't try to re-encode already-encoded bytes when serializing.: https://github.com/web-platform-tests/wpt/commit/db02d2880ad332389e619262130354bf7f9e4e21
Sync Mozilla tests as of https://hg.mozilla.org/mozilla-central/rev/fe6020e5c9d901a40fa2e7ea2f1ab2a36bf6d856 . (#12342): https://github.com/web-platform-tests/wpt/commit/526dde4f947afb3c93dd809b1622371465146a87
[IntersectionObserver] Fix target rect calculation for LayoutInline.: https://github.com/web-platform-tests/wpt/commit/8d1a4d053fbbe9a407b150807b5804ab3ab1d839
Part a: Add a wasm setting to the wpt .ini expectation files: https://github.com/web-platform-tests/wpt/commit/d309efd6d5a63376db72494c21d403624c14d7af
Add some tests for the Wasm JS API; +bbouvier: https://github.com/web-platform-tests/wpt/commit/5c219ef55a4b2099c0f4c53b9669df10d73e6f3a
Fix some typos in testharness.js.: https://github.com/web-platform-tests/wpt/commit/5ee7f865c347c346d8bf3295d7b5e2602f5caca7
Merge pull request #10926 from Tavmjong/markers-orient: https://github.com/web-platform-tests/wpt/commit/eea0b54014e970a2f94f1c35ec6e18ece76beb76
Merge pull request #10868 from Tavmjong/inline-size: https://github.com/web-platform-tests/wpt/commit/4d887869b49459f5fc5313171b94aea62de7d7bb
Merge pull request #10275 from dstorey/svgaelement-additions: https://github.com/web-platform-tests/wpt/commit/60f5bae752dd625ae83a730c635254cdb9f3d970
Merge pull request #10249 from dstorey/svg-document-element-events: https://github.com/web-platform-tests/wpt/commit/1529e32ac8073c48e872e7d705a10daa24decbbf
Merge pull request #10871 from Tavmjong/multi-line: https://github.com/web-platform-tests/wpt/commit/910640bcb4924b36e4cd5fc1dc0fd12ff13c09be
Remove unneeded test meta data.: https://github.com/web-platform-tests/wpt/commit/9c456d381680262cdba72fbf6fdddc73258e7be3
Remove unneeded test meta data.: https://github.com/web-platform-tests/wpt/commit/4d54a9c8e573d710aaf0eb4b55a64efe22e0bae2
Remove unused test data per review.: https://github.com/web-platform-tests/wpt/commit/f3ec29736a50376439bfbe2ee413460b110ef558
Fix lint error.: https://github.com/web-platform-tests/wpt/commit/4dbb7a824857465007ec63b079be64a5c3ded6e4
Add test for marker 'orient' attribute.: https://github.com/web-platform-tests/wpt/commit/958c04309c56b46b3afa21d1a674c248485763d1
Fix titles.: https://github.com/web-platform-tests/wpt/commit/4b16c3d9d5ce50d8f3346ac6766ac8d26b8a5383
Add basic text multiline text (via 'white-space').: https://github.com/web-platform-tests/wpt/commit/36d925eee2a1e1e89d795f67281c92e43126d4ff
Fix casing for a element: https://github.com/web-platform-tests/wpt/commit/d89cd24ee381abb6cd74fc315779281d86bffe1d
Add SVGAElement relList test: https://github.com/web-platform-tests/wpt/commit/2a03903267f9b09cf4d8b616eb6c72c069ec3f2f
Add download test: https://github.com/web-platform-tests/wpt/commit/6560a759371ed28b0e5d7cba48c2f13d9f95e321
Add tests for a.text: https://github.com/web-platform-tests/wpt/commit/aa1d3d13e679b8114983a440b601e2003515dcc6
Add tests for a.rel: https://github.com/web-platform-tests/wpt/commit/1297db1895c6c15897cf63da55b57ecaf78dcaee
Add test for DocumentAndElementEventHandlers in SVG: https://github.com/web-platform-tests/wpt/commit/d241659cf7ee83d5b0b15b999676a2ca7b276808
Add basic text 'inline-size' tests.: https://github.com/web-platform-tests/wpt/commit/abfa69e689f63065e243ca8629ef1a4c33326362