Modifies RtpTransportControllerSend to store a raw pointer to send side
congestion controller(SSCC). This avoids a race between destruction of
the send_side_cc_ unique pointer and calling AvailableBandwidth on
the SSCC instance from the OnNetworkChanged callback.
Bug: None
Change-Id: I11f414d7db48ab0b29a049b9488b073c1551113d
Reviewed-on: https://webrtc-review.googlesource.com/64640
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22604}
947120f969