[m53 merge] Use LeastUnacked to calculate the packet number length instead of GetLeastPacketAwaited…

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index 33e79fec8772c65adcd7e6b5f814231888a06c8b..f6851203765f99dc43dedac0b794d06bbf7dc740 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -989,6 +989,7 @@ 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_;