Update from https://crrev.com/306655

net/quic/test_tools/quic_sent_packet_manager_peer.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_TEST_TOOLS_QUIC_SENT_PACKET_MANAGER_PEER_H_
 #define NET_QUIC_TEST_TOOLS_QUIC_SENT_PACKET_MANAGER_PEER_H_
 
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_sent_packet_manager.h"
 
@@ skipping 24 matching lines @@
                                SendAlgorithmInterface* send_algorithm);
 
   static const LossDetectionInterface* GetLossAlgorithm(
       QuicSentPacketManager* sent_packet_manager);
 
   static void SetLossAlgorithm(QuicSentPacketManager* sent_packet_manager,
                                LossDetectionInterface* loss_detector);
 
   static RttStats* GetRttStats(QuicSentPacketManager* sent_packet_manager);
 
-  static size_t GetNackCount(
+  static QuicPacketCount GetNackCount(
       const QuicSentPacketManager* sent_packet_manager,
       QuicPacketSequenceNumber sequence_number);
 
   static size_t GetPendingRetransmissionCount(
       const QuicSentPacketManager* sent_packet_manager);
 
   static bool HasPendingPackets(
       const QuicSentPacketManager* sent_packet_manager);
 
   static QuicTime GetSentTime(const QuicSentPacketManager* sent_packet_manager,
@@ skipping 27 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicSentPacketManagerPeer);
 };
 
 }  // namespace test
 
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_QUIC_SENT_PACKET_MANAGER_PEER_H_