Drop ServiceWorkerTCPServer and use HTTPServer instead. ServiceWorkerTCPServer relies on TCPServer which is known to cause flakiness and sometimes hang in its destruction.
<rdar://86646140>
Created attachment 447478 [details] Patch
Committed r287223 (245386@main): <https://commits.webkit.org/245386@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 447478 [details].