Delete out of date comment, and unused forward declaration. No behavior change.

net/quic/core/quic_protocol.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_PROTOCOL_H_
 #define NET_QUIC_QUIC_PROTOCOL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 22 matching lines @@
 #include "net/quic/core/quic_constants.h"
 #include "net/quic/core/quic_error_codes.h"
 #include "net/quic/core/quic_time.h"
 #include "net/quic/core/quic_types.h"
 #include "net/quic/core/quic_versions.h"
 
 namespace net {
 
 class QuicPacket;
 struct QuicPacketHeader;
-class QuicAckListenerInterface;
-
-// Version and Crypto tags are written to the wire with a big-endian
-// representation of the name of the tag.  For example
-// the client hello tag (CHLO) will be written as the
-// following 4 bytes: 'C' 'H' 'L' 'O'.  Since it is
-// stored in memory as a little endian uint32_t, we need
-// to reverse the order of the bytes.
 
 // Size in bytes of the data packet header.
 NET_EXPORT_PRIVATE size_t GetPacketHeaderSize(QuicVersion version,
                                               const QuicPacketHeader& header);
 
 NET_EXPORT_PRIVATE size_t
 GetPacketHeaderSize(QuicVersion version,
                     QuicConnectionIdLength connection_id_length,
                     bool include_version,
                     bool include_path_id,
@@ skipping 689 matching lines @@
   QuicPathId path_id;
   bool has_crypto_handshake;
   int num_padding_bytes;
   EncryptionLevel encryption_level;
   QuicPacketNumberLength packet_number_length;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PROTOCOL_H_