Audio-only files do not have a device picker, so update when video tracks are added or removed.
<rdar://problem/20907253>
Created attachment 252910 [details] Proposed patch.
Comment on attachment 252910 [details] Proposed patch. r=me.
Comment on attachment 252910 [details] Proposed patch. Clearing flags on attachment: 252910 Committed r184140: <http://trac.webkit.org/changeset/184140>
All reviewed patches have been landed. Closing bug.