Keep disabled RtpRtcp modules registered.

webrtc/video/vie_channel.h

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 311 matching lines @@
   FrameCounts receive_frame_counts_ GUARDED_BY(crit_);
   IncomingVideoStream* incoming_video_stream_ GUARDED_BY(crit_);
   RtcpIntraFrameObserver* const intra_frame_observer_;
   RtcpRttStats* const rtt_stats_;
   PacedSender* const paced_sender_;
   PacketRouter* const packet_router_;
 
   const rtc::scoped_ptr<RtcpBandwidthObserver> bandwidth_observer_;
   TransportFeedbackObserver* const transport_feedback_observer_;
 
-  int nack_history_size_sender_;
   int max_nack_reordering_threshold_;
   I420FrameCallback* pre_render_callback_ GUARDED_BY(crit_);
 
   int64_t last_rtt_ms_ GUARDED_BY(crit_);
 
   // RtpRtcp modules, declared last as they use other members on construction.
   const std::vector<RtpRtcp*> rtp_rtcp_modules_;
   size_t num_active_rtp_rtcp_modules_ GUARDED_BY(crit_);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_VIE_CHANNEL_H_