Remove largest_observed_ from QuicSentPacketManager, since it's also in

net/quic/quic_sent_packet_manager.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_QUIC_SENT_PACKET_MANAGER_H_
 #define NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 205 matching lines @@
   // Enables pacing if it has not already been enabled.
   void EnablePacing();
 
   bool using_pacing() const { return using_pacing_; }
 
   void set_debug_delegate(DebugDelegate* debug_delegate) {
     debug_delegate_ = debug_delegate;
   }
 
   QuicPacketSequenceNumber largest_observed() const {
-    return largest_observed_;
+    return unacked_packets_.largest_observed();
   }
 
   QuicPacketSequenceNumber least_packet_awaited_by_peer() {
     return least_packet_awaited_by_peer_;
   }
 
   void set_network_change_visitor(NetworkChangeVisitor* visitor) {
     DCHECK(!network_change_visitor_);
     DCHECK(visitor);
     network_change_visitor_ = visitor;
@@ skipping 114 matching lines @@
   AckNotifierManager ack_notifier_manager_;
 
   const QuicClock* clock_;
   QuicConnectionStats* stats_;
   DebugDelegate* debug_delegate_;
   NetworkChangeVisitor* network_change_visitor_;
   RttStats rtt_stats_;
   scoped_ptr<SendAlgorithmInterface> send_algorithm_;
   scoped_ptr<LossDetectionInterface> loss_algorithm_;
 
-  // The largest sequence number which we have sent and received an ACK for
-  // from the peer.
-  QuicPacketSequenceNumber largest_observed_;
-
   // Least sequence number which the peer is still waiting for.
   QuicPacketSequenceNumber least_packet_awaited_by_peer_;
 
   // Tracks the first RTO packet.  If any packet before that packet gets acked,
   // it indicates the RTO was spurious and should be reversed(F-RTO).
   QuicPacketSequenceNumber first_rto_transmission_;
   // Number of times the RTO timer has fired in a row without receiving an ack.
   size_t consecutive_rto_count_;
   // Number of times the tail loss probe has been sent.
   size_t consecutive_tlp_count_;
@@ skipping 18 matching lines @@
   // Records bandwidth from server to client in normal operation, over periods
   // of time with no loss events.
   QuicSustainedBandwidthRecorder sustained_bandwidth_recorder_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSentPacketManager);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_