WPT import https://crrev.com/c/1357310 introduced new failures in external/wpt/css/css-break:

List of new failures:
external/wpt/css/css-break/page-break-legacy-shorthands.html new failing tests: https://crrev.com/c/1357310/4/third_party/blink/web_tests/external/wpt/css/css-break/page-break-legacy-shorthands-expected.txt

This import contains upstream changes from 4607d1909da9497c45795ea486dc49fe75f05635 to c2ab83d334a621b06e973ef88cb85169fb473100:
Implement page-break-{before,after} as legacy shorthands for {before,after}.: https://github.com/web-platform-tests/wpt/commit/c2ab83d334a621b06e973ef88cb85169fb473100 [affecting this directory]