http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-abortedonmain.html is quite flaky on Yosemite WK2, both debug and release: https://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#showAllRuns=true&showExpectations=true&revision=179740&tests=http%2Ftests%2Fxmlhttprequest%2Ftimeout%2Fxmlhttprequest-timeout-abortedonmain.html
-PASS XHR2 Timeout Property Tests -PASS XHR2 Timeout Property Tests 1 +FAIL XHR2 Timeout Property Tests assert_equals: time to abort is 0, timeout set at 400 expected "abort" but got "timeout"(stack: assert@http://127.0.0.1:8000/w3c/resources/testharness.js:2061:73 +assert_equals@http://127.0.0.1:8000/w3c/resources/testharness.js:699:15 +http://127.0.0.1:8000/xmlhttprequest/timeout/xmlhttprequest-timeout-runner.js:7:40 +step@http://127.0.0.1:8000/w3c/resources/testharness.js:1160:30 +test@http://127.0.0.1:8000/w3c/resources/testharness.js:443:22 +testResultCallbackHandler@http://127.0.0.1:8000/xmlhttprequest/timeout/xmlhttprequest-timeout-runner.js:7:13)
WebKit xmlhttprequest/timeout tests were removed in favor of WPT version which are not flaky (increased timeouts mainly).