Instead of using raw pointers.
Also, ensure callbacks are registered on the correct thread.
Nat servers are test only code.
Bug: webrtc:11943
Change-Id: Ib70a5966acb512f1a07212a07aaedab70aa20f9b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/331260
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
Reviewed-by: Jonas Oreland <jonaso@google.com>
Cr-Commit-Position: refs/heads/main@{#41372}
a8cd2babcd