Revert of Refactor NACK bitrate allocation

webrtc/modules/rtp_rtcp/include/receive_statistics.h

 /*
  *  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.
  */
 
@@ skipping 28 matching lines @@
   // retransmitted packet, false otherwise.
   virtual bool IsRetransmitOfOldPacket(const RTPHeader& header,
                                        int64_t min_rtt) const = 0;
 
   // Returns true if |sequence_number| is received in order, false otherwise.
   virtual bool IsPacketInOrder(uint16_t sequence_number) const = 0;
 };
 
 typedef std::map<uint32_t, StreamStatistician*> StatisticianMap;
 
-class ReceiveStatistics {
+class ReceiveStatistics : public Module {
  public:
   virtual ~ReceiveStatistics() {}
 
   static ReceiveStatistics* Create(Clock* clock);
 
   // Updates the receive statistics with this packet.
   virtual void IncomingPacket(const RTPHeader& rtp_header,
                               size_t packet_length,
                               bool retransmitted) = 0;
 
@@ skipping 22 matching lines @@
 
 class NullReceiveStatistics : public ReceiveStatistics {
  public:
   void IncomingPacket(const RTPHeader& rtp_header,
                       size_t packet_length,
                       bool retransmitted) override;
   void FecPacketReceived(const RTPHeader& header,
                          size_t packet_length) override;
   StatisticianMap GetActiveStatisticians() const override;
   StreamStatistician* GetStatistician(uint32_t ssrc) const override;
+  int64_t TimeUntilNextProcess() override;
+  void Process() override;
   void SetMaxReorderingThreshold(int max_reordering_threshold) override;
   void RegisterRtcpStatisticsCallback(
       RtcpStatisticsCallback* callback) override;
   void RegisterRtpStatisticsCallback(
       StreamDataCountersCallback* callback) override;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_RECEIVE_STATISTICS_H_