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

webrtc/modules/remote_bitrate_estimator/test/estimators/remb.cc

Index: webrtc/modules/remote_bitrate_estimator/test/estimators/remb.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/test/estimators/remb.cc b/webrtc/modules/remote_bitrate_estimator/test/estimators/remb.cc
index b1f364b45166fc80f9435c8672ec35a7e7d9f729..c12b269099b5b11b399a09799abd0f56b55505b3 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/estimators/remb.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/estimators/remb.cc
@@ -113,11 +113,11 @@ FeedbackPacket* RembReceiver::GetFeedback(int64_t now_ms) {
     StatisticianMap statisticians = recv_stats_->GetActiveStatisticians();
     RTCPReportBlock report_block;
     if (!statisticians.empty()) {
-      report_block = BuildReportBlock(statisticians.begin()->second);
+      latest_report_block_ = BuildReportBlock(statisticians.begin()->second);
     }
 
     feedback = new RembFeedback(flow_id_, now_ms * 1000, last_feedback_ms_,
-                                estimated_bps, report_block);
+                                estimated_bps, latest_report_block_);
     last_feedback_ms_ = now_ms;
 
     double estimated_kbps = static_cast<double>(estimated_bps) / 1000.0;
@@ -137,8 +137,7 @@ RTCPReportBlock RembReceiver::BuildReportBlock(
     StreamStatistician* statistician) {
   RTCPReportBlock report_block;
   RtcpStatistics stats;
-  if (!statistician->GetStatistics(&stats, true))
-    return report_block;
+  RTC_DCHECK(statistician->GetStatistics(&stats, true));
   report_block.fractionLost = stats.fraction_lost;
   report_block.cumulativeLost = stats.cumulative_lost;
   report_block.extendedHighSeqNum = stats.extended_max_sequence_number;