Revert of Move delay_based_bwe_ into CongestionController

webrtc/audio/audio_send_stream_unittest.cc

Index: webrtc/audio/audio_send_stream_unittest.cc
diff --git a/webrtc/audio/audio_send_stream_unittest.cc b/webrtc/audio/audio_send_stream_unittest.cc
index 318ea955cf79dd0906c0d17164235d9330ff6d16..1a838d891b8de9d2c75940f1d83d9e796ed00571 100644
--- a/webrtc/audio/audio_send_stream_unittest.cc
+++ b/webrtc/audio/audio_send_stream_unittest.cc
@@ -151,13 +151,15 @@
           .Times(1);
       EXPECT_CALL(*channel_proxy_,
                   RegisterSenderCongestionControlObjects(
-                      congestion_controller_.pacer(), &congestion_controller_,
+                      congestion_controller_.pacer(),
+                      congestion_controller_.GetTransportFeedbackObserver(),
                       packet_router(), Ne(nullptr)))
           .Times(1);
     } else {
       EXPECT_CALL(*channel_proxy_,
                   RegisterSenderCongestionControlObjects(
-                      congestion_controller_.pacer(), &congestion_controller_,
+                      congestion_controller_.pacer(),
+                      congestion_controller_.GetTransportFeedbackObserver(),
                       packet_router(), Eq(nullptr)))
           .Times(1);
     }