[MSE] Fix runtime errors caused by mediasource IDL attributes.
Created attachment 215195 [details] Patch
Comment on attachment 215195 [details] Patch Failing tests are unrelated to MediaSource. Adding cq+.
Comment on attachment 215195 [details] Patch Clearing flags on attachment: 215195 Committed r158040: <http://trac.webkit.org/changeset/158040>
All reviewed patches have been landed. Closing bug.