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-Commit-Position: refs/heads/master@{#19529}
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h b/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
index a167c13..5f0b151 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
@@ -165,8 +165,7 @@
   void HandleXrDlrrReportBlock(const rtcp::ReceiveTimeInfo& rti)
       EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);
 
-  void HandleXrTargetBitrate(uint32_t ssrc,
-                             const rtcp::TargetBitrate& target_bitrate,
+  void HandleXrTargetBitrate(const rtcp::TargetBitrate& target_bitrate,
                              PacketInformation* packet_information)
       EXCLUSIVE_LOCKS_REQUIRED(rtcp_receiver_lock_);