WPT import https://crrev.com/c/1180856 introduced new failures in external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0:

List of new failures:
external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/fieldset-display.html new failing tests: https://crrev.com/c/1180856/4/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/fieldset-display-expected.txt

This import contains upstream changes from 2ac3315a2d73c6252a86ef2b4e1f5aae1dc55faf to 1fbb6c1db6321c617158e2291168e75e1af1d209:
HTML: fieldset used value for CSS 'display': https://github.com/web-platform-tests/wpt/commit/1fbb6c1db6321c617158e2291168e75e1af1d209 [affecting this directory]
HTML: default style for fieldset: https://github.com/web-platform-tests/wpt/commit/b6a5c0ba587b58a11c63dc5595318f3a7ec59082 [affecting this directory]
HTML: fieldset's legend and position: relative: https://github.com/web-platform-tests/wpt/commit/3e3892163140bcb51c2c015b1132fd817d3bc3f8 [affecting this directory]
Bump the manifest version to 5 (#12563): https://github.com/web-platform-tests/wpt/commit/052d3a71637062a4ecf7266aa138ccdc8ae2c983
[wptserver] Correct value in unit test (#12565): https://github.com/web-platform-tests/wpt/commit/1b3c289f0ca989acf84b9b9e6a5f74071621af8e