The media accessibility service is not an XPC service, but is listed as such in the sandbox.
<rdar://75750989>
Created attachment 424153 [details] Patch
Comment on attachment 424153 [details] Patch r=me
Comment on attachment 424153 [details] Patch Thanks for reviewing!
Committed r274955: <https://commits.webkit.org/r274955> All reviewed patches have been landed. Closing bug and clearing flags on attachment 424153 [details].