WPT import https://crrev.com/c/1182959 introduced new failures in external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0:

List of new failures:
[ Linux ] external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/legend-sans-fieldset-display.html new failing tests: https://crrev.com/c/1182959/4/third_party/WebKit/LayoutTests/platform/linux/external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/legend-sans-fieldset-display-expected.txt
[ Mac ] external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/legend-sans-fieldset-display.html new failing tests: https://crrev.com/c/1182959/4/third_party/WebKit/LayoutTests/platform/mac/external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/legend-sans-fieldset-display-expected.txt
[ Win ] external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/legend-sans-fieldset-display.html new failing tests: https://crrev.com/c/1182959/4/third_party/WebKit/LayoutTests/platform/win/external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/legend-sans-fieldset-display-expected.txt

This import contains upstream changes from 4797b9cde63931bf7c49a74e2589a12dd619bec1 to 7c7bf8c1f7b8f7ec46e30fc490a8418317819b20:
HTML: legend sans fieldset and CSS display: https://github.com/web-platform-tests/wpt/commit/7c7bf8c1f7b8f7ec46e30fc490a8418317819b20 [affecting this directory]
Add tests for cross-origin redirects getting back to the original origin (#12566): https://github.com/web-platform-tests/wpt/commit/c5400eeca28ce5b1dd10d442f0c39a6274d8522d