Videos on Facebook Stories do not play
<rdar://72948549>
Created attachment 418096 [details] Patch
Committed r271725: <https://trac.webkit.org/changeset/271725> All reviewed patches have been landed. Closing bug and clearing flags on attachment 418096 [details].
To test this Go to https://www.facebook.com/stories/
Embedded FB video in another context on https://www.universityofgalway.ie/t4training/examples/embedded-videos/