last_target_rate_ and current_target_rate_msg_ both kept track of the
same value. pacer_configured_ was not used at all. This CL removes
both last_target_rate_ and pacer_configured_.
Bug: None
Change-Id: Ieb15c38c7d0c44730bef95492e3e677d505f054e
Reviewed-on: https://webrtc-review.googlesource.com/70184
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22909}