Try to switch to an alternate <source> element if the current media player doesn't support AirPlay when the user selects an AirPlay route
<rdar://problem/101136233>
Pull request: https://github.com/WebKit/WebKit/pull/5380
Committed 255624@main (4ec10f6ab820): <https://commits.webkit.org/255624@main> Reviewed commits have been landed. Closing PR #5380 and removing active labels.