net: Cleanup class/struct forward declarations

net/quic/core/crypto/crypto_framer.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_CRYPTO_CRYPTO_FRAMER_H_
 #define NET_QUIC_CRYPTO_CRYPTO_FRAMER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 #include "net/quic/core/crypto/crypto_handshake_message.h"
 #include "net/quic/core/quic_protocol.h"
 
 namespace net {
 
 class CryptoFramer;
 class QuicData;
-class QuicDataReader;
 class QuicDataWriter;
 
 class NET_EXPORT_PRIVATE CryptoFramerVisitorInterface {
  public:
   virtual ~CryptoFramerVisitorInterface() {}
 
   // Called if an error is detected.
   virtual void OnError(CryptoFramer* framer) = 0;
 
   // Called when a complete handshake message has been parsed.
@@ skipping 74 matching lines @@
   // tags_and_lengths_ contains the tags that are currently being parsed and
   // their lengths.
   std::vector<std::pair<QuicTag, size_t>> tags_and_lengths_;
   // Cumulative length of all values in the message currently being parsed.
   size_t values_len_;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_CRYPTO_FRAMER_H_