Add a new MediaCapabilitiesExtensionsEnabled setting
Created attachment 364912 [details] Patch
<rdar://problem/48954626>
Comment on attachment 364912 [details] Patch r=me
Comment on attachment 364912 [details] Patch Clearing flags on attachment: 364912 Committed r243046: <https://trac.webkit.org/changeset/243046>
All reviewed patches have been landed. Closing bug.