WPT import https://crrev.com/c/1325563 introduced new failures in external/wpt/streams:

List of new failures:
external/wpt/streams/piping/abort.dedicatedworker.html new failing tests: https://crrev.com/c/1325563/4/third_party/WebKit/LayoutTests/external/wpt/streams/piping/abort.dedicatedworker-expected.txt
external/wpt/streams/piping/abort.html new failing tests: https://crrev.com/c/1325563/4/third_party/WebKit/LayoutTests/external/wpt/streams/piping/abort-expected.txt
external/wpt/streams/piping/abort.sharedworker.html new failing tests: https://crrev.com/c/1325563/4/third_party/WebKit/LayoutTests/external/wpt/streams/piping/abort.sharedworker-expected.txt
external/wpt/streams/piping/abort.serviceworker.https.html new failing tests: https://crrev.com/c/1325563/4/third_party/WebKit/LayoutTests/external/wpt/streams/piping/abort.serviceworker.https-expected.txt

This import contains upstream changes from f30b2e0e5bc4aa75f43d9a1c024514601439c35a to b759b821c3f77719cadc53a58f00239b321b9b2d:
Merge pull request #13979 from ewilligers/filter-effects-reviewers: https://github.com/web-platform-tests/wpt/commit/b759b821c3f77719cadc53a58f00239b321b9b2d
html: Fix an issue of type-change-state.html about selectionDirection="none": https://github.com/web-platform-tests/wpt/commit/603b17f321fe4275050c59c87b1f3a29a33e9c96
Fix the default behavior of scale:<number>{1}.: https://github.com/web-platform-tests/wpt/commit/d736af67a066afebdd223f96a02af40203112257
[filter-effects] Add chrishtr as reviewer: https://github.com/web-platform-tests/wpt/commit/1ea85775c50479fb733c1a271850a47498efce14
Sync Mozilla CSS tests as of https://hg.mozilla.org/mozilla-central/rev/d87537833fcfd8d18f4d1c2782631c79c161a281 . (#13974): https://github.com/web-platform-tests/wpt/commit/cd44958a002b1ad494168e0290554644de84526e
Update replaceTrack after removeTrack tests (#13916): https://github.com/web-platform-tests/wpt/commit/c13b42a8177ffae4bddfce578e1f7c92e7064e40
[streams] Add tests for aborting pipeTo(): https://github.com/web-platform-tests/wpt/commit/349d41838068164e37a1cbd1c8c6ffeba4c72177 [affecting this directory]
[Background Fetch] Reject call to updateUI if event is inactive.: https://github.com/web-platform-tests/wpt/commit/8762072fac59630a7dd6e024dc7ceab71e86ffcc
Window onerror is not triggered bug fix: https://github.com/web-platform-tests/wpt/commit/920e3b1051f7bcb1fff98417cf91c904dbbdd36a
[wdspec] Assert for expected screenshot dimensions.: https://github.com/web-platform-tests/wpt/commit/dea2771ead6b51f268efcdc56860e3ae2275185b
[wdspec] Use shared assert_png() method in screenshot tests.: https://github.com/web-platform-tests/wpt/commit/c783b965c837f642e882ab0e975f8c73ab815816
extend timeout on wpt tests because linux asan: https://github.com/web-platform-tests/wpt/commit/d30c8c0d83542b960be19a18cb57bfea5555264d
webkit: add support for the WPE port (#13863): https://github.com/web-platform-tests/wpt/commit/89692eac0360247e56ba1ae4c32ea38cf1b6a9a0
Ensure that lone surrogates don't appear in wptreport json (#13828): https://github.com/web-platform-tests/wpt/commit/275904c8b770d10a9d67f6786b75dd4461a9a932
update wpt feature policy tests, making them long tests: https://github.com/web-platform-tests/wpt/commit/1a7cb3deb6c8661e4cf245a7ffc3e324fb6795f2
webkit: provide port name as run info (#13862): https://github.com/web-platform-tests/wpt/commit/9b9cf22d132ce60af8ad1801fd347965a1a96bae
[ci] Complete Docker image update (#13960): https://github.com/web-platform-tests/wpt/commit/3b729257c88fc09f200993317b6b84c9ae0aee3b
Update pyflakes to 2.0.0 (#13925): https://github.com/web-platform-tests/wpt/commit/5cf3713e05fd6c76ed34fc1037f9e4e44d2296be