Refactor rtcp statistics: Rtcp module take narrow interface

webrtc/modules/rtp_rtcp/include/rtp_rtcp.h

Index: webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h b/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
index 693a6f8373ea351c8ffc47791bf742dc8f03e4f5..cf139d1aed4956ff2c6eb4d8aa71b2832f09af27 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
@@ -29,7 +29,7 @@ namespace webrtc {
 // Forward declarations.
 class OverheadObserver;
 class RateLimiter;
-class ReceiveStatistics;
+class ReceiveStatisticsReporter;
 class RemoteBitrateEstimator;
 class RtcEventLog;
 class RtpReceiver;
@@ -55,7 +55,7 @@ class RtpRtcp : public Module {
     // The clock to use to read time. If nullptr then system clock will be used.
     Clock* clock = nullptr;
 
-    ReceiveStatistics* receive_statistics;
+    ReceiveStatisticsReporter* receive_statistics;
 
     // Transport object that will be called when packets are ready to be sent
     // out on the network.