[Cast] RTT clean-up to the max!

chrome/renderer/media/cast_ipc_dispatcher.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 CHROME_RENDERER_MEDIA_CAST_IPC_DISPATCHER_H_
 #define CHROME_RENDERER_MEDIA_CAST_IPC_DISPATCHER_H_
 
 #include "base/callback.h"
 #include "base/id_map.h"
 #include "ipc/ipc_channel_proxy.h"
@@ skipping 31 matching lines @@
       media::cast::CastTransportStatus status);
   void OnRtpStatistics(
       int32 channel_id,
       bool audio,
       const media::cast::RtcpSenderInfo& sender_info,
       base::TimeTicks time_sent,
       uint32 rtp_timestamp);
   void OnRawEvents(int32 channel_id,
                    const std::vector<media::cast::PacketEvent>& packet_events,
                    const std::vector<media::cast::FrameEvent>& frame_events);
-  void OnRtt(int32 channel_id,
-             uint32 ssrc,
-             const media::cast::RtcpRttReport& rtt_report);
+  void OnRtt(int32 channel_id, uint32 ssrc, base::TimeDelta rtt);
   void OnRtcpCastMessage(int32 channel_id,
                          uint32 ssrc,
                          const media::cast::RtcpCastMessage& cast_message);
 
   static CastIPCDispatcher* global_instance_;
 
   // For IPC Send(); must only be accesed on |io_message_loop_|.
   IPC::Sender* sender_;
 
   // Message loop on which IPC calls are driven.
   const scoped_refptr<base::MessageLoopProxy> io_message_loop_;
 
   // A map of stream ids to delegates; must only be accessed on
   // |io_message_loop_|.
   IDMap<CastTransportSenderIPC> id_map_;
   DISALLOW_COPY_AND_ASSIGN(CastIPCDispatcher);
 };
 
 #endif  // CHROME_RENDERER_MEDIA_CAST_IPC_DISPATCHER_H_