When a test failed flakily, we don't want to treat it as a failure or a flaky test even if the test failed with image only failure in retries.
This bug was observed on http://build.webkit.org/results/Apple%20MountainLion%20Release%20WK2%20(Tests)/r146827%20(7291)/results.html where a bunch of editing/unsupported-content/ tests were reported as failing even though they only had image only failures.
Created attachment 194978 [details] Fixes the bug
Created attachment 194980 [details] Rebaselined the test
Committed r146846: <http://trac.webkit.org/changeset/146846>