We don't want to delay the dispose of a web view because an icon load decision is still pending, so let's use a weak reference instead of a strong one. This fixes memory leaks reported by unit tests with 2022 API now that favicons are enabled by default.
Pull request: https://github.com/WebKit/WebKit/pull/9228
Committed 259524@main (5757289eb640): <https://commits.webkit.org/259524@main> Reviewed commits have been landed. Closing PR #9228 and removing active labels.