WPT import https://crrev.com/c/1212487 introduced new failures in external/wpt/css:

List of new failures:
external/wpt/css/css-scrollbars/textarea-scrollbar-width-none.html [ Failure ]

This import contains upstream changes from 1719e8bdd2ffcbbbe48b66c3ec5779f247083a8e to d9e07766cac7ca7abf6792aba3093745148824e7:
Fix #12876: set -ex on ci_taskcluster.sh: https://github.com/web-platform-tests/wpt/commit/d9e07766cac7ca7abf6792aba3093745148824e7
Make --venv work again: https://github.com/web-platform-tests/wpt/commit/a3fcabdf03938af0c20129117295e98534f8b7cc
Add tests for WebAssembly static methods: https://github.com/web-platform-tests/wpt/commit/3afe03b34b5313b40c802150c519111ca0b8ccb0
Fix stability check when tests are skipped: https://github.com/web-platform-tests/wpt/commit/eb145fc244f183d7c3aab7a93560330e666159e9
Have anonymous element in text input inherit scrollbar-width from the element.: https://github.com/web-platform-tests/wpt/commit/a0fb7d2ce0f998e0a054e94205fbcda4fe3813b4 [affecting this directory]