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

webrtc/modules/rtp_rtcp/source/receive_statistics_impl.cc

Index: webrtc/modules/rtp_rtcp/source/receive_statistics_impl.cc
diff --git a/webrtc/modules/rtp_rtcp/source/receive_statistics_impl.cc b/webrtc/modules/rtp_rtcp/source/receive_statistics_impl.cc
index 6d64304149d662f746c78563e389a1e03deea921..fe5f02b45b71237e720b1325fc0cfc16f920a1fd 100644
--- a/webrtc/modules/rtp_rtcp/source/receive_statistics_impl.cc
+++ b/webrtc/modules/rtp_rtcp/source/receive_statistics_impl.cc
@@ -422,8 +422,8 @@ void ReceiveStatisticsImpl::FecPacketReceived(const RTPHeader& header,
 }
 
 StatisticianMap ReceiveStatisticsImpl::GetActiveStatisticians() const {
-  rtc::CritScope cs(&receive_statistics_lock_);
   StatisticianMap active_statisticians;
+  rtc::CritScope cs(&receive_statistics_lock_);
   for (StatisticianImplMap::const_iterator it = statisticians_.begin();
        it != statisticians_.end(); ++it) {
     uint32_t secs;