Remove an unused declaration of QuicAckNotifier.

net/quic/quic_packet_generator.cc

 // Copyright (c) 2012 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/quic_packet_generator.h"
 
 #include "base/logging.h"
 #include "net/quic/quic_bug_tracker.h"
 #include "net/quic/quic_fec_group.h"
 #include "net/quic/quic_flags.h"
 #include "net/quic/quic_utils.h"
 
 using base::StringPiece;
 
 namespace net {
 
-class QuicAckNotifier;
-
 QuicPacketGenerator::QuicPacketGenerator(QuicConnectionId connection_id,
                                          QuicFramer* framer,
                                          QuicRandom* random_generator,
                                          QuicBufferAllocator* buffer_allocator,
                                          DelegateInterface* delegate)
     : delegate_(delegate),
       packet_creator_(connection_id,
                       framer,
                       random_generator,
                       buffer_allocator,
@@ skipping 329 matching lines @@
 
 FecSendPolicy QuicPacketGenerator::fec_send_policy() {
   return packet_creator_.fec_send_policy();
 }
 
 void QuicPacketGenerator::set_fec_send_policy(FecSendPolicy fec_send_policy) {
   packet_creator_.set_fec_send_policy(fec_send_policy);
 }
 
 }  // namespace net