NetworkDataTask's ThreadSafeWeakPtrControlBlock are leaking, causing unbounded memory growth in the network process.
<rdar://112162921>
Pull request: https://github.com/WebKit/WebKit/pull/16375
Committed 266594@main (177d6881d88d): <https://commits.webkit.org/266594@main> Reviewed commits have been landed. Closing PR #16375 and removing active labels.