See: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Ffiles%2Fcreate-blob-url-crash.html&showExpectations=true&group=%40ToT%20-%20chromium.org
Is this still flaky? I don't see any flakiness in fast/files locally.
Looks like it's probably fine. I will close this and remove the suppression from our expectations file.