A preparation for splitting server sockets out into a separate interface, see https://webrtc-review.googlesource.com/c/src/+/232607. Transition plan: 1. Land this cl. 2. Update downstream code to use the new name. 3. Attempt landing https://webrtc-review.googlesource.com/c/src/+/232607. May need additional steps to not break downstream implementations of PacketSocketFactory::CreateServerTcpSocket. Bug: webrtc:13065 Change-Id: Ife448c705222f4c9f66a096e3dc7eb07e0f9c3af Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/233700 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35155}