WPT import https://crrev.com/c/1181062 introduced new failures in external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0:

List of new failures:
[ Mac ] external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/fieldset-multicol.html new failing tests: https://crrev.com/c/1181062/4/third_party/WebKit/LayoutTests/platform/mac/external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/fieldset-multicol-expected.txt
[ Win ] external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/fieldset-multicol.html new failing tests: https://crrev.com/c/1181062/4/third_party/WebKit/LayoutTests/platform/win/external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/fieldset-multicol-expected.txt

This import contains upstream changes from 1fbb6c1db6321c617158e2291168e75e1af1d209 to 0caf88f800d70c086bf481e009abb29affb49a40:
Fieldset should support multicol: https://github.com/web-platform-tests/wpt/commit/0caf88f800d70c086bf481e009abb29affb49a40 [affecting this directory]
Fix test failures: https://github.com/web-platform-tests/wpt/commit/0b6cd235f8be14633260ff4a18202ec7edf0700e
Support list values in wptmanifest conditionals: https://github.com/web-platform-tests/wpt/commit/77eb4118c5f7ba8b460b7df838fd03488072fbc1