Refactor: simplify interface of SenderRtcpSession and CastTransport.

media/cast/net/rtcp/rtcp_defines.h

 // 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.
 
 #ifndef MEDIA_CAST_NET_RTCP_RTCP_DEFINES_H_
 #define MEDIA_CAST_NET_RTCP_RTCP_DEFINES_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 108 matching lines @@
   // Time of event logged.
   base::TimeTicks timestamp;
 
   // Render/playout delay. Only set for FRAME_PLAYOUT events.
   base::TimeDelta delay_delta;
 
   // Only set for packet events.
   uint16_t packet_id;
 };
 
-typedef base::Callback<void(const RtcpCastMessage&)> RtcpCastMessageCallback;
-typedef base::Callback<void(base::TimeDelta)> RtcpRttCallback;
-typedef
-base::Callback<void(const RtcpReceiverLogMessage&)> RtcpLogMessageCallback;
-typedef base::Callback<void()> RtcpPliCallback;
-
 // TODO(hubbe): Document members of this struct.
 struct RtpReceiverStatistics {
   RtpReceiverStatistics();
   uint8_t fraction_lost;
   uint32_t cumulative_lost;  // 24 bits valid.
   uint32_t extended_high_sequence_number;
   uint32_t jitter;
 };
 
 // Created on a RTP receiver to be passed over IPC.
@@ skipping 16 matching lines @@
   base::TimeDelta target_delay;
   std::unique_ptr<std::vector<std::pair<RtpTimeTicks, RtcpEvent>>> rtcp_events;
   std::unique_ptr<RtpReceiverStatistics> rtp_receiver_statistics;
 };
 
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_NET_RTCP_RTCP_DEFINES_H_