net: Cleanup class/struct forward declarations

net/quic/core/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 <stddef.h>
 
 #include <deque>
 
 #include "base/macros.h"
 #include "net/base/net_export.h"
 #include "net/quic/core/quic_protocol.h"
 
 namespace net {
 
-class AckNotifierManager;
-
 // Class which tracks unacked packets for three purposes:
 // 1) Track retransmittable data, including multiple transmissions of frames.
 // 2) Track packets and bytes in flight for congestion control.
 // 3) Track sent time of packets to provide RTT measurements from acks.
 class NET_EXPORT_PRIVATE QuicUnackedPacketMap {
  public:
   QuicUnackedPacketMap();
   ~QuicUnackedPacketMap();
 
   // Adds |serialized_packet| to the map and marks it as sent at |sent_time|.
@@ skipping 164 matching lines @@
   QuicByteCount 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_