WPT import https://crrev.com/c/938780 introduced new failures in external/wpt/streams:

List of new failures:
[ Mac-mac10.12 ] external/wpt/streams/piping/error-propagation-forward.html new failing tests: https://crrev.com/c/938780/3/third_party/WebKit/LayoutTests/platform/mac-mac10.12/external/wpt/streams/piping/error-propagation-forward-expected.txt
[ Win ] external/wpt/streams/piping/error-propagation-forward.html new failing tests: https://crrev.com/c/938780/3/third_party/WebKit/LayoutTests/platform/win/external/wpt/streams/piping/error-propagation-forward-expected.txt
[ Mac-mac10.12 ] external/wpt/streams/piping/error-propagation-forward.dedicatedworker.html new failing tests: https://crrev.com/c/938780/3/third_party/WebKit/LayoutTests/platform/mac-mac10.12/external/wpt/streams/piping/error-propagation-forward.dedicatedworker-expected.txt
[ Win ] external/wpt/streams/piping/error-propagation-forward.dedicatedworker.html new failing tests: https://crrev.com/c/938780/3/third_party/WebKit/LayoutTests/platform/win/external/wpt/streams/piping/error-propagation-forward.dedicatedworker-expected.txt
[ Mac-mac10.12 ] external/wpt/streams/piping/error-propagation-forward.sharedworker.html new failing tests: https://crrev.com/c/938780/3/third_party/WebKit/LayoutTests/platform/mac-mac10.12/external/wpt/streams/piping/error-propagation-forward.sharedworker-expected.txt
[ Win ] external/wpt/streams/piping/error-propagation-forward.sharedworker.html new failing tests: https://crrev.com/c/938780/3/third_party/WebKit/LayoutTests/platform/win/external/wpt/streams/piping/error-propagation-forward.sharedworker-expected.txt
[ Mac-mac10.12 ] external/wpt/streams/piping/error-propagation-forward.serviceworker.https.html new failing tests: https://crrev.com/c/938780/3/third_party/WebKit/LayoutTests/platform/mac-mac10.12/external/wpt/streams/piping/error-propagation-forward.serviceworker.https-expected.txt
[ Win ] external/wpt/streams/piping/error-propagation-forward.serviceworker.https.html new failing tests: https://crrev.com/c/938780/3/third_party/WebKit/LayoutTests/platform/win/external/wpt/streams/piping/error-propagation-forward.serviceworker.https-expected.txt

This import contains upstream changes from 9ff5d62fc664214b86ec8ef4b07aaa8097f7ebed to e28a4f29f2394547dfbcc82df5f96c5436edb837:
Make the data-url-shared.html test a bit prettier/simpler: https://github.com/w3c/web-platform-tests/commit/e28a4f29f2394547dfbcc82df5f96c5436edb837
Check if git is a batch file on Windows: https://github.com/w3c/web-platform-tests/commit/0503e45c79168576d5672532901a7df0545b05fd
Add a long timeout to acid 3 test, bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1439170 gecko-commit: 99f1ea44fc7915b8b7b33bce4732fa8765fd3ac2 gecko-integration-branch: autoland gecko-reviewers: gsnedders: https://github.com/w3c/web-platform-tests/commit/ca849f854d804134893b6c3e1a17d96eb7ff817f
ReadableStream piping: Add tests for shutting down when readable becomes errored with preventAbort = true (#9591): https://github.com/w3c/web-platform-tests/commit/5154532d4152e2cb8b75cbfbcf1c9e6bb4fe651c [affecting this directory]
tests show(detailsPromise) resolves as expected (#9663): https://github.com/w3c/web-platform-tests/commit/c4970cbd309c7fdafbb401ab4d0d67875247c1dd
[css-typed-om] Add more property tests.: https://github.com/w3c/web-platform-tests/commit/9659a35d816ff1b32835a2eccf3e0117dea4e5ce
HTMLMediaElement: set `muted_` when cloning element with muted attribute.: https://github.com/w3c/web-platform-tests/commit/82efd0226a261a41be569357efa2a65596f1fb75
Move more chrome webaudio layout tests to WPT: https://github.com/w3c/web-platform-tests/commit/1dd2953e47d12905513d7a295370c3e74bdc6948
[LayoutNG] Need to lay out legacy objects to figure out their inline size.: https://github.com/w3c/web-platform-tests/commit/c3e1a513c1d09c2b4544ad05ea3f03ba8483af27