Reland "Reland "Extracts ssrc based feedback tracking from feedback adapter.""

This reverts commit d2d7a47247187236ce62e3c842963f6e4e9f0f1f.

Reason for revert: This revert is not needed. Failure was not due to webrtc.

Original change's description:
> Revert "Reland "Extracts ssrc based feedback tracking from feedback adapter.""
> 
> This reverts commit d61338fa6ed957dd992f25da4844db34b14f89c7.
> 
> Reason for revert: Causing a build break:
> webrtc/call/BUILD:300:1: Undeclared inclusion(s) in rule 'webrtc/call:rtp_sender':
> this rule is missing dependency declarations for the following files included by 'call/rtp_transport_controller_send.cc':
>   'webrtc/modules/congestion_controller/rtp/transport_feedback_demuxer.h'
> 
> 
> 
> Original change's description:
> > Reland "Extracts ssrc based feedback tracking from feedback adapter."
> > 
> > This is a reland of 08c46adc1e9f9a8d74357fe132a68906ae6e6974
> > 
> > Original change's description:
> > > Extracts ssrc based feedback tracking from feedback adapter.
> > > 
> > > This prepares for moving TransportFeedbackAdapter to TaskQueue.
> > > 
> > > Bug: webrtc:9883
> > > Change-Id: Ib333f6a6837ff6dd8b10813e8953e4d8cd5d8633
> > > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/162040
> > > Reviewed-by: Erik Språng <sprang@webrtc.org>
> > > Commit-Queue: Sebastian Jansson <srte@webrtc.org>
> > > Cr-Commit-Position: refs/heads/master@{#30076}
> > 
> > Bug: webrtc:9883
> > Change-Id: Ia74a3b1fba4d83eece9b0eb6475d6e6aecb65700
> > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/162201
> > Reviewed-by: Erik Språng <sprang@webrtc.org>
> > Commit-Queue: Sebastian Jansson <srte@webrtc.org>
> > Cr-Commit-Position: refs/heads/master@{#30266}
> 
> TBR=sprang@webrtc.org,srte@webrtc.org
> 
> Change-Id: I7f3f872c7ff863a37ad8dca08051fe1e04671bfb
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: webrtc:9883
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/166182
> Reviewed-by: JT Teh <jtteh@webrtc.org>
> Commit-Queue: JT Teh <jtteh@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#30270}

TBR=sprang@webrtc.org,srte@webrtc.org,jtteh@webrtc.org

Change-Id: Idd1073ebfef77b2154d7123b47dacb479537c550
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:9883
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/166200
Reviewed-by: JT Teh <jtteh@webrtc.org>
Commit-Queue: JT Teh <jtteh@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30271}
diff --git a/call/rtp_transport_controller_send.h b/call/rtp_transport_controller_send.h
index b5a53d7..4e9ff4d 100644
--- a/call/rtp_transport_controller_send.h
+++ b/call/rtp_transport_controller_send.h
@@ -24,6 +24,7 @@
 #include "call/rtp_video_sender.h"
 #include "modules/congestion_controller/rtp/control_handler.h"
 #include "modules/congestion_controller/rtp/transport_feedback_adapter.h"
+#include "modules/congestion_controller/rtp/transport_feedback_demuxer.h"
 #include "modules/pacing/paced_sender.h"
 #include "modules/pacing/packet_router.h"
 #include "modules/pacing/rtp_packet_pacer.h"
@@ -149,6 +150,7 @@
   std::unique_ptr<TaskQueuePacedSender> task_queue_pacer_;
 
   TargetTransferRateObserver* observer_ RTC_GUARDED_BY(task_queue_);
+  TransportFeedbackDemuxer feedback_demuxer_;
 
   // TODO(srte): Move all access to feedback adapter to task queue.
   TransportFeedbackAdapter transport_feedback_adapter_;