WPT import https://crrev.com/c/1152313 introduced new failures in external/wpt/css:

List of new failures:
external/wpt/css/css-properties-values-api/idlharness.html new failing tests: https://crrev.com/c/1152313/4/third_party/WebKit/LayoutTests/external/wpt/css/css-properties-values-api/idlharness-expected.txt

This import contains upstream changes from 695587524e9823ba7e6b124d3fef8b55644cf850 to b1f0b037511dbfb6ce9801c57fecc7efed944482:
[OOR-CORS] Add a wpt for CORS with sandboxed-iframe: https://github.com/web-platform-tests/wpt/commit/b1f0b037511dbfb6ce9801c57fecc7efed944482
webrtc wpt: remove generateMediaStreamTrack, add cleanup after getNoiseStream: https://github.com/web-platform-tests/wpt/commit/36c9fdd4ef36c289f416a16707074157d818ea7c
[wdspec] Add tests for Refresh navigation command.: https://github.com/web-platform-tests/wpt/commit/e79b848573e4ee775977695a7ed4ecf3e774114a
[wdspec] Add tests for Back navigation command.: https://github.com/web-platform-tests/wpt/commit/73f19218e0d688e982f3e6b04f5ff6ada83d1972
[wdspec] Add tests for Forward navigation command.: https://github.com/web-platform-tests/wpt/commit/6cc402a8f9595bb92d50fe9510fad8513afbd62e
[wdspec] Use a default window size of 800x600. (#12207): https://github.com/web-platform-tests/wpt/commit/38ee01419de80dcbc8be2f3e08a4a5453a7b66cf
Test ConstantSourceNode where stop has been called with the parameter lower or equal than the parameter to start.: https://github.com/web-platform-tests/wpt/commit/cf802ca8331fb69fba71acae41de4b1379d4ff95
Fix a few `should` constructs in `constant-source-output.html`.: https://github.com/web-platform-tests/wpt/commit/698b52db914265a539623d062c18c0c373393005
Update Chrome WebDriver capabilities to use vendor prefix (#11649): https://github.com/web-platform-tests/wpt/commit/312f233727faaeb58269f4cb2ea67a534e35402b
Update the css-properties-values-api IDL file (#9774): https://github.com/web-platform-tests/wpt/commit/a71bbf196f17d9da2fec0a3b842aa267dff9c8cb [affecting this directory]