Refactor of QUIC's rtt storage and calculation to have a single RttStats

net/quic/test_tools/quic_sent_packet_manager_peer.h

Index: net/quic/test_tools/quic_sent_packet_manager_peer.h
diff --git a/net/quic/test_tools/quic_sent_packet_manager_peer.h b/net/quic/test_tools/quic_sent_packet_manager_peer.h
index 163e10c6fba8b4f61df0a725d98a2375531782c1..ff861894e2b8a4881294f9d2d527a10433fcbf53 100644
--- a/net/quic/test_tools/quic_sent_packet_manager_peer.h
+++ b/net/quic/test_tools/quic_sent_packet_manager_peer.h
@@ -25,6 +25,8 @@ class QuicSentPacketManagerPeer {
   static void SetLossAlgorithm(QuicSentPacketManager* sent_packet_manager,
                                LossDetectionInterface* loss_detector);
 
+  static RttStats* GetRttStats(QuicSentPacketManager* sent_packet_manager);
+
   static size_t GetNackCount(
       const QuicSentPacketManager* sent_packet_manager,
       QuicPacketSequenceNumber sequence_number);
@@ -38,8 +40,6 @@ class QuicSentPacketManagerPeer {
   static QuicTime GetSentTime(const QuicSentPacketManager* sent_packet_manager,
                               QuicPacketSequenceNumber sequence_number);
 
-  static QuicTime::Delta rtt(QuicSentPacketManager* sent_packet_manager);
-
   // Returns true if |sequence_number| is a retransmission of a packet.
   static bool IsRetransmission(QuicSentPacketManager* sent_packet_manager,
                                QuicPacketSequenceNumber sequence_number);