Fix issue where the number of packets reported in tests/simulations sometimes are negative.

webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.h

 /*
  *  Copyright (c) 2015 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 29 matching lines @@
   std::unique_ptr<RemoteBitrateEstimator> rbe_;
   std::unique_ptr<RtcpBandwidthObserver> feedback_observer_;
 
  private:
   Clock* const clock_;
   RTCPReportBlock report_block_;
   SendTimeHistory send_time_history_;
   bool has_received_ack_;
   uint16_t last_acked_seq_num_;
   int64_t last_log_time_ms_;
+  SequenceNumberUnwrapper seq_num_unwrapper_;
   ::testing::NiceMock<MockRtcEventLog> event_log_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(FullBweSender);
 };
 
 class SendSideBweReceiver : public BweReceiver {
  public:
   explicit SendSideBweReceiver(int flow_id);
   virtual ~SendSideBweReceiver();
 
   void ReceivePacket(int64_t arrival_time_ms,
                      const MediaPacket& media_packet) override;
   FeedbackPacket* GetFeedback(int64_t now_ms) override;
 
  private:
   int64_t last_feedback_ms_;
   std::vector<PacketInfo> packet_feedback_vector_;
 };
 
 }  // namespace bwe
 }  // namespace testing
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_ESTIMATORS_SEND_SIDE_H_