Revert of Move delay_based_bwe_ into CongestionController

webrtc/audio/audio_send_stream.cc

Index: webrtc/audio/audio_send_stream.cc
diff --git a/webrtc/audio/audio_send_stream.cc b/webrtc/audio/audio_send_stream.cc
index 438d1cc78a5aca5d7657b6368bfbac03fa5aed8e..2d0c99b33a6bb23358b72ca85176ad0679630d6e 100644
--- a/webrtc/audio/audio_send_stream.cc
+++ b/webrtc/audio/audio_send_stream.cc
@@ -86,7 +86,8 @@
     }
   }
   channel_proxy_->RegisterSenderCongestionControlObjects(
-      congestion_controller->pacer(), congestion_controller, packet_router,
+      congestion_controller->pacer(),
+      congestion_controller->GetTransportFeedbackObserver(), packet_router,
       bandwidth_observer_.get());
   if (!SetupSendCodec()) {
     LOG(LS_ERROR) << "Failed to set up send codec state.";