Cast: Simplify code path for RTCP sender report

media/cast/transport/transport_audio_sender.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/cast/transport/transport_audio_sender.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "media/cast/transport/rtp_sender/rtp_sender.h"
@@ skipping 50 matching lines @@
 }
 
 void TransportAudioSender::ResendPackets(
     const MissingFramesAndPacketsMap& missing_frames_and_packets) {
   if (!initialized_) {
     return;
   }
   rtp_sender_.ResendPackets(missing_frames_and_packets);
 }
 
-void TransportAudioSender::SubscribeAudioRtpStatsCallback(
-    const CastTransportRtpStatistics& callback) {
-  rtp_sender_.SubscribeRtpStatsCallback(callback);
-}
-
 }  // namespace transport
 }  // namespace cast
 }  // namespace media