Windows opt build reftests have been failing with REFTEST TEST-UNEXPECTED-FAIL | file:///c:/talos-slave/mozilla-central_win7_test-reftest/build/reftest/tests/layout/reftests/text/synthetic-bold-metrics-01.html | (!=) since bug 593564 was checked in (which added that test)
Pushed http://hg.mozilla.org/mozilla-central/rev/5e56eabfd349 to disable the test on Windows for now. Strange that it fails on Opt but passes on Debug... I'll try to reproduce locally and see what's going on.
This is due to bug 624310; when we fix that, we can re-enable this test on Windows.
Fixed by the patch in bug 624310.