WPT import https://crrev.com/c/1120854 introduced new failures in external/wpt/infrastructure:

List of new failures:
external/wpt/infrastructure/testdriver/click.html new failing tests: https://crrev.com/c/1120854/4/third_party/WebKit/LayoutTests/external/wpt/infrastructure/testdriver/click-expected.txt

This import contains upstream changes from 451270209b02ebade6f0fddd068fab9658f4816e to 8b8082f30267410e4b3729439be23df8b803dde8:
[testdriver.js] Implement `bless` method (#11511): https://github.com/web-platform-tests/wpt/commit/8b8082f30267410e4b3729439be23df8b803dde8
Make sure stacking context is always updated for ::first-letter.: https://github.com/web-platform-tests/wpt/commit/02cfdfe53b794884bcd731e18f845bec59dfd707
Update trivial IDL changes (#11732): https://github.com/web-platform-tests/wpt/commit/7706fe685052caf0d9295123913ed4a7dddfb6a5
Fix make_hosts_file tests in python 3. (#11727): https://github.com/web-platform-tests/wpt/commit/75676053b648fbe89988922f357faaa485bb5b88