contentMIMETypes should be empty for MediaStreams being loaded
<rdar://problem/21735678>
Created attachment 256422 [details] Patch
Comment on attachment 256422 [details] Patch r=me.
Comment on attachment 256422 [details] Patch Clearing flags on attachment: 256422 Committed r186544: <http://trac.webkit.org/changeset/186544>
All reviewed patches have been landed. Closing bug.