net: Cleanup class/struct forward declarations

net/quic/core/quic_stream_sequencer.h

 // 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.
 
 #ifndef NET_QUIC_QUIC_STREAM_SEQUENCER_H_
 #define NET_QUIC_QUIC_STREAM_SEQUENCER_H_
 
 #include <stddef.h>
 
 #include <map>
 
 #include "base/macros.h"
 #include "net/base/net_export.h"
 #include "net/quic/core/quic_protocol.h"
 #include "net/quic/core/quic_stream_sequencer_buffer.h"
 
 namespace net {
 
 namespace test {
 class QuicStreamSequencerPeer;
 }  // namespace test
 
 class QuicClock;
-class QuicSession;
 class QuicStream;
 
 // Buffers frames until we have something which can be passed
 // up to the next layer.
 class NET_EXPORT_PRIVATE QuicStreamSequencer {
  public:
   QuicStreamSequencer(QuicStream* quic_stream, const QuicClock* clock);
   virtual ~QuicStreamSequencer();
 
   // If the frame is the next one we need in order to process in-order data,
@@ skipping 107 matching lines @@
 
   // If true, all incoming data will be discarded.
   bool ignore_read_data_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicStreamSequencer);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_STREAM_SEQUENCER_H_