Instead of using PacketTransportInternal::SignalReadPacket.
Bug: webrtc:15368
Change-Id: Icdc2d7f85df6db944f0ba0232891e6c5a8986a66
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/340440
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41823}