Cast: Simplify code path for RTCP sender report

media/cast/audio_sender/audio_sender.h

Index: media/cast/audio_sender/audio_sender.h
diff --git a/media/cast/audio_sender/audio_sender.h b/media/cast/audio_sender/audio_sender.h
index 1a2eedd3e4f47bdd853fc3bf0cb581e2d3281616..5965167ae71d7670ef69a68f557ae8146167cc41 100644
--- a/media/cast/audio_sender/audio_sender.h
+++ b/media/cast/audio_sender/audio_sender.h
@@ -55,10 +55,6 @@ class AudioSender : public base::NonThreadSafe,
   void ResendPackets(
       const MissingFramesAndPacketsMap& missing_frames_and_packets);
 
-  void StoreStatistics(const transport::RtcpSenderInfo& sender_info,
-                       base::TimeTicks time_sent,
-                       uint32 rtp_timestamp);
-
   void ScheduleNextRtcpReport();
   void SendRtcpReport();
 
@@ -67,7 +63,7 @@ class AudioSender : public base::NonThreadSafe,
   scoped_refptr<CastEnvironment> cast_environment_;
   transport::CastTransportSender* const transport_sender_;
   scoped_ptr<AudioEncoder> audio_encoder_;
-  RtpSenderStatistics rtp_stats_;
+  RtpTimestampHelper rtp_timestamp_helper_;
   scoped_ptr<LocalRtcpAudioSenderFeedback> rtcp_feedback_;
   Rtcp rtcp_;
   bool timers_initialized_;