Filter receiver-side DataCountersUpdated on SSRC.

BUG=1788,1667
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/44509004

Cr-Commit-Position: refs/heads/master@{#8575}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8575 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/video/receive_statistics_proxy.cc

@@ -89,7 +89,8 @@ void ReceiveStatisticsProxy::DataCountersUpdated(
     const webrtc::StreamDataCounters& counters,
     uint32_t ssrc) {
   CriticalSectionScoped lock(crit_.get());
-
+  if (stats_.ssrc != ssrc)
+    return;
   stats_.rtp_stats = counters;
 }