Added DISALLOW_COPY_AND_ASSIGN to disable copy/assign.

net/quic/crypto/crypto_utils.h

 // Copyright (c) 2013 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.
 //
 // Some helpers for quic crypto
 
 #ifndef NET_QUIC_CRYPTO_CRYPTO_UTILS_H_
 #define NET_QUIC_CRYPTO_CRYPTO_UTILS_H_
 
 #include <string>
@@ skipping 44 matching lines @@
   // controls whether the server's keys are assigned to |encrypter| or
   // |decrypter|. |server_nonce| is optional and, if non-empty, is mixed into
   // the key derivation.
   static bool DeriveKeys(base::StringPiece premaster_secret,
                          QuicTag aead,
                          base::StringPiece client_nonce,
                          base::StringPiece server_nonce,
                          const std::string& hkdf_input,
                          Perspective perspective,
                          CrypterPair* out);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CryptoUtils);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_CRYPTO_UTILS_H_