The following layout test is flaky on Mac editing/spelling/spellcheck-paste.html
"foo" is not marked as misspelling often in my environment.
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&revision=102709&tests=editing%2Fspelling%2Fspellcheck-paste.html&group=%40ToT%20-%20webkit.org