Make use of more smart pointers in Source/WebKit/UIProcess/Mac/.
Pull request: https://github.com/WebKit/WebKit/pull/16872
Committed 267082@main (33dcd2da7b87): <https://commits.webkit.org/267082@main> Reviewed commits have been landed. Closing PR #16872 and removing active labels.
<rdar://problem/114176739>