Capture WeakPtr to CachedResourceClient in lambdas in CachedRawResource::didAddClient() instead of a raw pointer, for hardening.
<rdar://93781799>
Pull request: https://github.com/WebKit/WebKit/pull/944
Committed r294692 (250896@main): <https://commits.webkit.org/250896@main> Reviewed commits have been landed. Closing PR #944 and removing active labels.