Let's bring AccessibilityNodeObject in line with https://github.com/WebKit/WebKit/wiki/Smart-Pointer-Usage-Guidelines.
<rdar://problem/107628579>
rdar://107589983
Created attachment 465766 [details] Patch
Created attachment 465767 [details] Patch
Committed 262614@main (2cd8ae7e10ea): <https://commits.webkit.org/262614@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 465767 [details].