Refactor rtcp statistics: Rtcp module take narrow interface

webrtc/video/video_send_stream.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include "webrtc/video/video_send_stream.h"
@@ skipping 44 matching lines @@
     FlexfecSender* flexfec_sender,
     SendStatisticsProxy* stats_proxy,
     SendDelayStats* send_delay_stats,
     RtcEventLog* event_log,
     RateLimiter* retransmission_rate_limiter,
     OverheadObserver* overhead_observer,
     size_t num_modules,
     RtpKeepAliveConfig keepalive_config) {
   RTC_DCHECK_GT(num_modules, 0);
   RtpRtcp::Configuration configuration;
-  ReceiveStatistics* null_receive_statistics = configuration.receive_statistics;
   configuration.audio = false;
   configuration.receiver_only = false;
   configuration.flexfec_sender = flexfec_sender;
-  configuration.receive_statistics = null_receive_statistics;
   configuration.outgoing_transport = outgoing_transport;
   configuration.intra_frame_callback = intra_frame_callback;
   configuration.bandwidth_callback = bandwidth_callback;
   configuration.transport_feedback_callback =
       transport->transport_feedback_observer();
   configuration.rtt_stats = rtt_stats;
   configuration.rtcp_packet_type_counter_observer = stats_proxy;
   configuration.paced_sender = transport->packet_sender();
   configuration.transport_sequence_number_allocator =
       transport->packet_router();
@@ skipping 1290 matching lines @@
       std::min(config_->rtp.max_packet_size,
                kPathMTU - transport_overhead_bytes_per_packet_);
 
   for (RtpRtcp* rtp_rtcp : rtp_rtcp_modules_) {
     rtp_rtcp->SetMaxRtpPacketSize(rtp_packet_size);
   }
 }
 
 }  // namespace internal
 }  // namespace webrtc