WPT import https://crrev.com/c/937571 introduced new failures in external/wpt/infrastructure:

List of new failures:
[ Mac-mac10.12 ] external/wpt/infrastructure/assumptions/html-elements.html new failing tests: https://crrev.com/c/937571/4/third_party/WebKit/LayoutTests/platform/mac-mac10.12/external/wpt/infrastructure/assumptions/html-elements-expected.txt
[ Win ] external/wpt/infrastructure/assumptions/html-elements.html new failing tests: https://crrev.com/c/937571/4/third_party/WebKit/LayoutTests/platform/win/external/wpt/infrastructure/assumptions/html-elements-expected.txt

This import contains upstream changes from eb5edccf4ccdd623f4230bab13805106f9a32fc1 to 9ff5d62fc664214b86ec8ef4b07aaa8097f7ebed:
Update assumptions test to match HTML spec (#9674): https://github.com/w3c/web-platform-tests/commit/9ff5d62fc664214b86ec8ef4b07aaa8097f7ebed [affecting this directory]