WPT import https://crrev.com/c/1161617 introduced new failures in external/wpt/mediacapture-streams:

List of new failures:
external/wpt/mediacapture-streams/MediaStream-removetrack.https.html new failing tests: https://crrev.com/c/1161617/4/third_party/WebKit/LayoutTests/external/wpt/mediacapture-streams/MediaStream-removetrack.https-expected.txt

This import contains upstream changes from c82a9f16b158508dd100617352c6e2e60d0910d0 to 1d73b48a813903b363972cddafdd864099aed233:
Check cache.keys() when there are requests with VARY headers.: https://github.com/web-platform-tests/wpt/commit/1d73b48a813903b363972cddafdd864099aed233
Test NotificationEvent only in service workers (#12286): https://github.com/web-platform-tests/wpt/commit/78cdede8c4847b3dd51430c9b838ac38c56813c1
Fix webusb IDL test (#12274): https://github.com/web-platform-tests/wpt/commit/896f8e65c74296db709eacb430694093c5a0144d
Update the notifications IDL file (#11859): https://github.com/web-platform-tests/wpt/commit/cdf07c95993dd35ba073d54a60a1f309b9bded72
Cookie Store API: Remove `httpOnly` option: https://github.com/web-platform-tests/wpt/commit/ca6120560c151d9dac81afa6a834a217db6e5ed6
Update the push-api IDL and tests (#11925): https://github.com/web-platform-tests/wpt/commit/0faf45e40a52f7b2dfa291ab1b68b002a77bb257
Merge pull request #12271 from jan-ivar/ended: https://github.com/web-platform-tests/wpt/commit/6d2c774db441cc8dafa21d2c4fd407557b098a31
Update the WebXR IDL file + test (#11872): https://github.com/web-platform-tests/wpt/commit/4799e567ecb0217ebe0bfd26094f7cf9e8bea171
Update the css-typed-om IDL file + test (#11893): https://github.com/web-platform-tests/wpt/commit/b66333a7e818b32c829b6ee1ad2373f551dbeb8b
Update selenium from 3.13.0 to 3.14.0: https://github.com/web-platform-tests/wpt/commit/016c7a7400a1d4be17e0c3710148163d2a247f82
Update selenium from 3.13.0 to 3.14.0: https://github.com/web-platform-tests/wpt/commit/c0a7dbbb96e73e835789b4d90950178095d1625d
Update selenium from 3.13.0 to 3.14.0: https://github.com/web-platform-tests/wpt/commit/2203f16c7f21c582395455303ae15411955ba19b
Update selenium from 3.13.0 to 3.14.0: https://github.com/web-platform-tests/wpt/commit/c1579120e855828706e6a0c613be7c5def14d7f8
Update selenium from 3.13.0 to 3.14.0: https://github.com/web-platform-tests/wpt/commit/5107d39e27801e40ab034f1583dc4e84810603a4
Update selenium from 3.13.0 to 3.14.0: https://github.com/web-platform-tests/wpt/commit/ae2067a994d02dfb356706726c853a3278834788
Update selenium from 3.13.0 to 3.14.0: https://github.com/web-platform-tests/wpt/commit/ccc336b3cd3341e5c8d00c87f71c1ea9c9a9d0c5
Merge pull request #12230 from fippo/webrtc-muxpolicy: https://github.com/web-platform-tests/wpt/commit/c6e86383a5c00d5e78da28f92a7fefb8dc71db67
Update payment-handler IDL and tests (#11932): https://github.com/web-platform-tests/wpt/commit/adaebd60424a8f87f1b17ff6094ec490c16aff3a
Add the webrtc-stats IDL file + test (#11699): https://github.com/web-platform-tests/wpt/commit/ec8570ebda567074ecd4982253f46931be5eb03b
Add a default name ("idl_test setup") for idl_test (#12276): https://github.com/web-platform-tests/wpt/commit/70413d8d6bf4bf581e52bc3a5edddd205fbd7a41
Update media-capabilities IDL + test (#11947): https://github.com/web-platform-tests/wpt/commit/e90038bd29b39c5e4846e08762de475a48d64910
[idlharness.js] Catch IdlArray.test bugs better (#12272): https://github.com/web-platform-tests/wpt/commit/e9f3244421c353a63142dd9742e0ed6edc509cc8
Updated navigation-timing IDL file (#11945): https://github.com/web-platform-tests/wpt/commit/4a15e98c1339681493dff207de2c69ea29efa602
Use .tar.gz for test archives: https://github.com/web-platform-tests/wpt/commit/5c0e7ca33a26cb7b4ba027ec80a112e05d1e220d
URL: additional tests for URLSearchParams's sort(): https://github.com/web-platform-tests/wpt/commit/7cee0d238c42272d48fd06935c5abcf1e490b394
WPT for Clear-Site-Data executionContexts: https://github.com/web-platform-tests/wpt/commit/09d362241ad99dffc7d4c17f70ebbc0ae36743d6
Test that removal from a MediaStream fires ended on media elements.: https://github.com/web-platform-tests/wpt/commit/39f4392538758af2ae82a993b17f0faec72e50b2 [affecting this directory]
Modernize MediaStream-removetrack.https.html: https://github.com/web-platform-tests/wpt/commit/bbf272bb0053ea7f4341814da1fa696aee9953fc [affecting this directory]
webrtc: throw InvalidAccessError on mismatching rtcpmuxPolicy in setRemoteDescription: https://github.com/web-platform-tests/wpt/commit/c548b25d60df95a17b42116f6ebd798f101abca0