See flakiness dashboard: https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=inspector-protocol%2Fcss%2Fcss-get-rule-list.html&testType=webkit_tests

According to the flakiness dashboard, this test usually passes after multiple retries.

Example diff from one time that it failed on Win10: https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Win10/20548/layout-test-results/inspector-protocol/css/css-get-rule-list-pretty-diff.html

caseq@, can you think of any reason why this test would sometimes fail on the first run, but then pass on subsequent retries?