WPT import https://crrev.com/c/1070881 introduced new failures in external/wpt/webaudio:

List of new failures:
[ Mac10.12 ] external/wpt/webaudio/idlharness.https.html [ Timeout ]

This import contains upstream changes from 232137f0fdacdeed99a7df5dd229d23020b0bccc to 314de955a5102650136404f6439f22f8d838e0f4:
Implement policy: 'document-stream-insertion': https://github.com/w3c/web-platform-tests/commit/314de955a5102650136404f6439f22f8d838e0f4
Split the layout test for remove-track: https://github.com/w3c/web-platform-tests/commit/cdec7db504d74c9a6f371a05d92f2be35ac8cc60
Update the gamepad IDL file (#9785): https://github.com/w3c/web-platform-tests/commit/3443ff6e255454aa23182b3765a1f9a2841c6a90
Allow Text node in elementsFromPoint if descendant of SVG text content: https://github.com/w3c/web-platform-tests/commit/65a5c24ba9769da8b103f72349ea111b124e54db
Add a simple test for ResourceTiming |name| with Service Workers: https://github.com/w3c/web-platform-tests/commit/9633890103f1a7025405cab78b00bb318ed9ebc4
Rename foreign-object-paints-before-rect-expected.html to -ref.html: https://github.com/w3c/web-platform-tests/commit/4698cffbd33ce8e20b8ae6c6c3032569999d78b2
Update the vibration IDL file (#9838): https://github.com/w3c/web-platform-tests/commit/badf1722b0794e9982324465b8fd65308abcc7f6
`Sec-Metadata` prototype.: https://github.com/w3c/web-platform-tests/commit/02e79502650e09e815cf3e835c5bfaef9a591bd0
Update the selection-api IDL file (#9829): https://github.com/w3c/web-platform-tests/commit/79e45ec83e0416793fdb6c59cd95d0acab63e5f4
Update the battery IDL file (#9761): https://github.com/w3c/web-platform-tests/commit/4ac0ab86ed4610e135f20de0820e3d220135fb2d
Merge pull request #11124 from w3c/sync_40a0ace6add33a4b01d49514f2ff747b69b4c85a: https://github.com/w3c/web-platform-tests/commit/dd43ad0f4b05f5ccce197d6ccd030d67039ca491
update "navigation within beforeunload" test to match the spec: https://github.com/w3c/web-platform-tests/commit/40a0ace6add33a4b01d49514f2ff747b69b4c85a
css-grid] Update a few WPT / reftests to new percentage row-gap layout.: https://github.com/w3c/web-platform-tests/commit/7f56040b8f31a6960003e66298eb2f755b03de9f
Run autopep8 on *.py in cors, fetch and xhr (#11116): https://github.com/w3c/web-platform-tests/commit/15b8e55fa2a0fbf0851cb8e0846e0320e319c852
Remove PaymentCurrencyAmount's currencySystem member (#11099): https://github.com/w3c/web-platform-tests/commit/741b59a02016570df79d117a808bf2cfadd4bbf2
Navigation fragment decode and encodings (#8723): https://github.com/w3c/web-platform-tests/commit/5b878a1e5de29aa4e68c48e0122878f983f036ff
URL/Encoding: change query state parsing: https://github.com/w3c/web-platform-tests/commit/e399a2c694345240639c23cc5e9e4f077a47cf30
FormData: Strings from form controls should be converted to USVStrings: https://github.com/w3c/web-platform-tests/commit/6df97f3630e83ec0caf1854b559c488368436a68
Initial Merge of WritableStreams Tests w/Upstream W3C (#6499): https://github.com/w3c/web-platform-tests/commit/a695026c7758c2f2d78aad1d2f511be5c9195b2d
Worker: Add service worker interception tests for module loading on dedicated workers: https://github.com/w3c/web-platform-tests/commit/347a7974c93326910109cd0f3386cc427add4ec5