In rdar://101642406 and rdar://101643644 I removed its last use. It is problematic to not ask/inform the UI process. Still do the callbacks, but assert that their return value is not WKBundlePagePolicyActionUse
Pull request: https://github.com/WebKit/WebKit/pull/5866
Committed 256080@main (1ec49aa7b55e): <https://commits.webkit.org/256080@main> Reviewed commits have been landed. Closing PR #5866 and removing active labels.