Use LeastUnacked to calculate the packet number length instead of GetLeastPacketAwaitedByPeer.

net/quic/core/quic_sent_packet_manager.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/core/quic_sent_packet_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 968 matching lines @@
 }
 
 QuicPacketNumber QuicSentPacketManager::GetLargestObserved(QuicPathId) const {
   return unacked_packets_.largest_observed();
 }
 
 QuicPacketNumber QuicSentPacketManager::GetLargestSentPacket(QuicPathId) const {
   return unacked_packets_.largest_sent_packet();
 }
 
+// Remove this method when deprecating QUIC_VERSION_33.
 QuicPacketNumber QuicSentPacketManager::GetLeastPacketAwaitedByPeer(
     QuicPathId) const {
   return least_packet_awaited_by_peer_;
 }
 
 void QuicSentPacketManager::SetNetworkChangeVisitor(
     NetworkChangeVisitor* visitor) {
   DCHECK(!network_change_visitor_);
   DCHECK(visitor);
   network_change_visitor_ = visitor;
@@ skipping 14 matching lines @@
 TransmissionInfo* QuicSentPacketManager::GetMutableTransmissionInfo(
     QuicPacketNumber packet_number) {
   return unacked_packets_.GetMutableTransmissionInfo(packet_number);
 }
 
 void QuicSentPacketManager::RemoveObsoletePackets() {
   unacked_packets_.RemoveObsoletePackets();
 }
 
 }  // namespace net