Cocoa accessibility passes the WebKit IPC mach port to accessibility needlessly Accessibility cannot use the WebKit internal IPC mach port for anything, and will not
<rdar://problem/100750359>
Some discussion in rdar.
Pull request: https://github.com/WebKit/WebKit/pull/4969
Committed 255157@main (6f856b4269ec): <https://commits.webkit.org/255157@main> Reviewed commits have been landed. Closing PR #4969 and removing active labels.