GetBandwidthObserver should be used instead as it exposes a smaller interface.
Bug: webrtc:8415
Change-Id: I29ca795657e205186d7ebd929e756038a294b5f7
Reviewed-on: https://webrtc-review.googlesource.com/23900
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20871}