WPT import https://crrev.com/c/925810 introduced new failures in external/wpt/service-workers:

List of new failures:
[ Mac-mac10.10 ] virtual/outofblink-cors/external/wpt/service-workers/service-worker/multipart-image.https.html new failing tests: https://crrev.com/c/925810/4/third_party/WebKit/LayoutTests/platform/mac-mac10.10/virtual/outofblink-cors/external/wpt/service-workers/service-worker/multipart-image.https-expected.txt
[ Mac-retina ] virtual/outofblink-cors/external/wpt/service-workers/service-worker/multipart-image.https.html new failing tests: https://crrev.com/c/925810/4/third_party/WebKit/LayoutTests/platform/mac-retina/virtual/outofblink-cors/external/wpt/service-workers/service-worker/multipart-image.https-expected.txt

This import contains upstream changes from 0eaf7631a0522afa4b5901265c8370ce22ba9cac to a5a46d493b6d3ebb7a214095549874af779f2ee0:
Fix a bug that document.importNode() doesn't clone Attr nodes with namespace.: https://github.com/w3c/web-platform-tests/commit/a5a46d493b6d3ebb7a214095549874af779f2ee0
[css-typed-om] Implement StylePropertyMap.clear.: https://github.com/w3c/web-platform-tests/commit/03384b28f145fcf905960ba5fd6af233c838859a
[css-typed-om] Allow mutations of CSSTransformValues.: https://github.com/w3c/web-platform-tests/commit/ae41c0ef35473e9288b6caad44573c37d1f5ea9d
Delete StylePropertyMap.update(): https://github.com/w3c/web-platform-tests/commit/8f3f3d57d537c956eed62f78172325e97f093025
cc Update messages.json expectations formatting: https://github.com/w3c/web-platform-tests/commit/1e4920885ba16ae3bed2b73668827adf4e5a4223
[css-typed-om] Allow mutations of CSSUnparsedValue.: https://github.com/w3c/web-platform-tests/commit/8fed98324bc133df221d778c62cbff210d43b0ce
[css-typed-om] Fix crash involving negative length perspectives.: https://github.com/w3c/web-platform-tests/commit/969ae697f67e35fb93c18fa36a57ff605a47256d
[css-typed-om] Handle out-of-range values correctly.: https://github.com/w3c/web-platform-tests/commit/ca39b1ed0fa70e60bfbcbfe5be7e305b0e5c2d20
Use a valid Python boolean value for Servo's options.: https://github.com/w3c/web-platform-tests/commit/db55c167d484d0e34fd618960887161522280d47
Change Content-Type-Options: nosniff allowed script MIME types to match the spec. bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1431095 gecko-commit: 38626987c0cfd6e715cfcc6f4f1a1209191a03c5 gecko-integration-branch: central gecko-reviewers: ckerschb: https://github.com/w3c/web-platform-tests/commit/03051e10b941576b3802d4930bff346afddbc55f
Fix #7142: Change manifest update process: https://github.com/w3c/web-platform-tests/commit/38612167f54c475836c122013756e92b9a8859cc
Fix wpt/beacon/headers/header-content-type.html slowness: https://github.com/w3c/web-platform-tests/commit/b20bddda8e47b046fc6ffccda4897cb81df14102
Test whether javascript: navigation aborts fetches in earlier navigation: https://github.com/w3c/web-platform-tests/commit/be7c5e5b09e85fcfa05135b335ff4a815236b1b6
Streams: Tests for abuse of RSBYOBRequest (#9558): https://github.com/w3c/web-platform-tests/commit/abcd6e9aeb4267511740c45bf8e484b5ca1d95db