Shrink critical-section scope in ReceiveStatisticsImpl::GetActiveStatisticians()

webrtc/modules/rtp_rtcp/source/receive_statistics_impl.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.
  */
 
@@ skipping 404 matching lines @@
                                               size_t packet_length) {
   rtc::CritScope cs(&receive_statistics_lock_);
   StatisticianImplMap::iterator it = statisticians_.find(header.ssrc);
   // Ignore FEC if it is the first packet.
   if (it != statisticians_.end()) {
     it->second->FecPacketReceived(header, packet_length);
   }
 }
 
 StatisticianMap ReceiveStatisticsImpl::GetActiveStatisticians() const {
+  StatisticianMap active_statisticians;
   rtc::CritScope cs(&receive_statistics_lock_);
-  StatisticianMap active_statisticians;
   for (StatisticianImplMap::const_iterator it = statisticians_.begin();
        it != statisticians_.end(); ++it) {
     uint32_t secs;
     uint32_t frac;
     it->second->LastReceiveTimeNtp(&secs, &frac);
     if (clock_->CurrentNtpInMilliseconds() -
         Clock::NtpToMs(secs, frac) < kStatisticsTimeoutMs) {
       active_statisticians[it->first] = it->second;
     }
   }
@@ skipping 74 matching lines @@
 void NullReceiveStatistics::SetMaxReorderingThreshold(
     int max_reordering_threshold) {}
 
 void NullReceiveStatistics::RegisterRtcpStatisticsCallback(
     RtcpStatisticsCallback* callback) {}
 
 void NullReceiveStatistics::RegisterRtpStatisticsCallback(
     StreamDataCountersCallback* callback) {}
 
 }  // namespace webrtc