Deny mach-lookup to the service 'com.apple.hiservices-xpcservice' in the WebContent process on macOS, since there are no longer any reports of this service being used.
<rdar://problem/68878470>
Created attachment 416993 [details] Patch
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Committed r271777: <https://trac.webkit.org/changeset/271777> All reviewed patches have been landed. Closing bug and clearing flags on attachment 416993 [details].