Remove largest_observed_ from QuicSentPacketManager, since it's also in

net/quic/quic_unacked_packet_map.h

 // Copyright 2014 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_UNACKED_PACKET_MAP_H_
 #define NET_QUIC_QUIC_UNACKED_PACKET_MAP_H_
 
 #include "net/base/linked_hash_map.h"
 #include "net/quic/quic_protocol.h"
 
@@ skipping 41 matching lines @@
 
   // Returns true if there are any unacked packets which have retransmittable
   // frames.
   bool HasUnackedRetransmittableFrames() const;
 
   // Returns the largest sequence number that has been sent.
   QuicPacketSequenceNumber largest_sent_packet() const {
     return largest_sent_packet_;
   }
 
+  // Returns the largest sequence number that has been acked.
+  QuicPacketSequenceNumber largest_observed() const {
+    return largest_observed_;
+  }
+
   // Returns the sum of bytes from all packets in flight.
   QuicByteCount bytes_in_flight() const {
     return bytes_in_flight_;
   }
 
   // Returns the smallest sequence number of a serialized packet which has not
   // been acked by the peer.  If there are no unacked packets, returns 0.
   QuicPacketSequenceNumber GetLeastUnackedSentPacket() const;
 
   // Sets a packet as sent with the sent time |sent_time|.  Marks the packet
@@ skipping 74 matching lines @@
   size_t bytes_in_flight_;
   // Number of retransmittable crypto handshake packets.
   size_t pending_crypto_packet_count_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicUnackedPacketMap);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_UNACKED_PACKET_MAP_H_