[UI-side compositing] NSScrollerImps are still created in the web process (triggering CATransactions)
rdar://109689491
Pull request: https://github.com/WebKit/WebKit/pull/15159
Committed 265731@main (1b57a2e0de6a): <https://commits.webkit.org/265731@main> Reviewed commits have been landed. Closing PR #15159 and removing active labels.