Drop the RTT as input to IsRetransmitOfOldPacket.

Bug: webrtc:7135
Change-Id: I532334934a757ba0ea6a2daf97b0f1cfd04246e6
Reviewed-on: https://webrtc-review.googlesource.com/12320
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23366}
diff --git a/modules/rtp_rtcp/source/receive_statistics_impl.h b/modules/rtp_rtcp/source/receive_statistics_impl.h
index d53787f..d0cd865 100644
--- a/modules/rtp_rtcp/source/receive_statistics_impl.h
+++ b/modules/rtp_rtcp/source/receive_statistics_impl.h
@@ -39,8 +39,7 @@
   void GetReceiveStreamDataCounters(
       StreamDataCounters* data_counters) const override;
   uint32_t BitrateReceived() const override;
-  bool IsRetransmitOfOldPacket(const RTPHeader& header,
-                               int64_t min_rtt) const override;
+  bool IsRetransmitOfOldPacket(const RTPHeader& header) const override;
   bool IsPacketInOrder(uint16_t sequence_number) const override;
 
   void IncomingPacket(const RTPHeader& rtp_header,