[Cast] RTT clean-up to the max!

media/cast/sender/frame_sender.h

Index: media/cast/sender/frame_sender.h
diff --git a/media/cast/sender/frame_sender.h b/media/cast/sender/frame_sender.h
index 7fda18721a8a5ed5f944349fe25904b2b8f0a19a..12cb17f7fbe079fca0123707c51cebae289b596e 100644
--- a/media/cast/sender/frame_sender.h
+++ b/media/cast/sender/frame_sender.h
@@ -50,12 +50,7 @@ class FrameSender {
   void ScheduleNextRtcpReport();
   void SendRtcpReport(bool schedule_future_reports);
 
-  void OnReceivedRtt(base::TimeDelta rtt,
-                     base::TimeDelta avg_rtt,
-                     base::TimeDelta min_rtt,
-                     base::TimeDelta max_rtt);
-
-  bool is_rtt_available() const { return rtt_available_; }
+  void OnMeasuredRoundTripTime(base::TimeDelta rtt);
 
   const scoped_refptr<CastEnvironment> cast_environment_;
 
@@ -68,13 +63,6 @@ class FrameSender {
 
   const uint32 ssrc_;
 
-  // RTT information from RTCP.
-  bool rtt_available_;
-  base::TimeDelta rtt_;
-  base::TimeDelta avg_rtt_;
-  base::TimeDelta min_rtt_;
-  base::TimeDelta max_rtt_;
-
  protected:
   // Schedule and execute periodic checks for re-sending packets.  If no
   // acknowledgements have been received for "too long," AudioSender will
@@ -175,6 +163,9 @@ class FrameSender {
   base::TimeTicks frame_reference_times_[256];
   RtpTimestamp frame_rtp_timestamps_[256];
 
+  // The most recently measured round trip time.
+  base::TimeDelta current_round_trip_time_;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<FrameSender> weak_factory_;