Change the QUIC CongestionMap to be based on a vector.

net/quic/quic_sent_packet_manager.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 #define NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 359 matching lines @@
   // Number of times the tail loss probe has been sent.
   size_t consecutive_tlp_count_;
   // Number of times the crypto handshake has been retransmitted.
   size_t consecutive_crypto_retransmission_count_;
   // Number of pending transmissions of TLP or crypto packets.
   size_t pending_timer_transmission_count_;
   // Maximum number of tail loss probes to send before firing an RTO.
   size_t max_tail_loss_probes_;
   bool using_pacing_;
 
-  // Sets of packets acked and lost as a result of the last congestion event.
-  SendAlgorithmInterface::CongestionMap packets_acked_;
-  SendAlgorithmInterface::CongestionMap packets_lost_;
+  // Vectors packets acked and lost as a result of the last congestion event.
+  SendAlgorithmInterface::CongestionVector packets_acked_;
+  SendAlgorithmInterface::CongestionVector packets_lost_;
 
   // Set to true after the crypto handshake has successfully completed. After
   // this is true we no longer use HANDSHAKE_MODE, and further frames sent on
   // the crypto stream (i.e. SCUP messages) are treated like normal
   // retransmittable frames.
   bool handshake_confirmed_;
 
   // Records bandwidth from server to client in normal operation, over periods
   // of time with no loss events.
   QuicSustainedBandwidthRecorder sustained_bandwidth_recorder_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSentPacketManager);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_