editing/pasteboard/drag-drop-dead-frame.html has been very flaky since r100203. It looks to me like the test just needs to wait for the iframe to load before it runs.
Created attachment 115147 [details] Patch
Comment on attachment 115147 [details] Patch Here's a speculative fix (I couldn't repro locally on chromium linux).
Oh, and a link to the flakiness dashboard: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=editing%2Fpasteboard%2Fdrag-drop-dead-frame.html
Comment on attachment 115147 [details] Patch Clearing flags on attachment: 115147 Committed r100297: <http://trac.webkit.org/changeset/100297>
All reviewed patches have been landed. Closing bug.
Comment on attachment 115147 [details] Patch Yes. Thanks!