Revert of Verify sender ssrc when receiving rtcp target bitrate (patchset #3 id:40001 of https://codereview.webrtc.org/3000373002/ )

Reason for revert:
Might be the root cause of an internal test failure.

Original issue's description:
> Verify sender ssrc when receiving rtcp target bitrate
>
> BUG=webrtc:8137
>
> Review-Url: https://codereview.webrtc.org/3000373002
> Cr-Commit-Position: refs/heads/master@{#19524}
> Committed: https://chromium.googlesource.com/external/webrtc/+/a7a4beb419612e16e781e143f9bc0c812e044f75

TBR=danilchap@webrtc.org,sprang@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:8137

Review-Url: https://codereview.webrtc.org/3005633002
Cr-Original-Commit-Position: refs/heads/master@{#19529}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 95a64ca8aa3ab20692bf8fbb24c7ea7b72abb0a6
3 files changed