Fix stats for encoder target bitrate when target rate is zero.

webrtc/video/send_statistics_proxy.cc

Index: webrtc/video/send_statistics_proxy.cc
diff --git a/webrtc/video/send_statistics_proxy.cc b/webrtc/video/send_statistics_proxy.cc
index abaa43800543ad29c7ef749848d0f1aa33954e4a..6815eb3d71917a852c19d5b6fc56a469a0d9d768 100644
--- a/webrtc/video/send_statistics_proxy.cc
+++ b/webrtc/video/send_statistics_proxy.cc
@@ -418,7 +418,7 @@ void SendStatisticsProxy::OnInactiveSsrc(uint32_t ssrc) {
   stats->width = 0;
 }
 
-void SendStatisticsProxy::OnSetRates(uint32_t bitrate_bps, int framerate) {
+void SendStatisticsProxy::OnSetEncoderTargetRate(uint32_t bitrate_bps) {
   rtc::CritScope lock(&crit_);
   stats_.target_media_bitrate_bps = bitrate_bps;
 }