Clean up type usage and fix MSVC "truncated value" warnings in net/quic/.

net/quic/test_tools/quic_sent_packet_manager_peer.cc

 // 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.
 
 #include "net/quic/test_tools/quic_sent_packet_manager_peer.h"
 
 #include "base/stl_util.h"
 #include "net/quic/congestion_control/loss_detection_interface.h"
 #include "net/quic/congestion_control/send_algorithm_interface.h"
 #include "net/quic/quic_protocol.h"
@@ skipping 54 matching lines @@
   sent_packet_manager->loss_algorithm_.reset(loss_detector);
 }
 
 // static
 RttStats* QuicSentPacketManagerPeer::GetRttStats(
     QuicSentPacketManager* sent_packet_manager) {
   return &sent_packet_manager->rtt_stats_;
 }
 
 // static
-size_t QuicSentPacketManagerPeer::GetNackCount(
+QuicPacketCount QuicSentPacketManagerPeer::GetNackCount(
     const QuicSentPacketManager* sent_packet_manager,
     QuicPacketSequenceNumber sequence_number) {
   return sent_packet_manager->unacked_packets_.
       GetTransmissionInfo(sequence_number).nack_count;
 }
 
 // static
 size_t QuicSentPacketManagerPeer::GetPendingRetransmissionCount(
     const QuicSentPacketManager* sent_packet_manager) {
   return sent_packet_manager->pending_retransmissions_.size();
@@ skipping 74 matching lines @@
 }
 
 // static
 QuicSustainedBandwidthRecorder& QuicSentPacketManagerPeer::GetBandwidthRecorder(
     QuicSentPacketManager* sent_packet_manager) {
   return sent_packet_manager->sustained_bandwidth_recorder_;
 }
 
 }  // namespace test
 }  // namespace net