Fix include guards for QUIC files.

net/quic/core/crypto/curve25519_key_exchange.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.
 
-#ifndef NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
-#define NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
+#ifndef NET_QUIC_CORE_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
+#define NET_QUIC_CORE_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 #include "net/quic/core/crypto/key_exchange.h"
 
@@ skipping 24 matching lines @@
 
  private:
   Curve25519KeyExchange();
 
   uint8_t private_key_[32];
   uint8_t public_key_[32];
 };
 
 }  // namespace net
 
-#endif  // NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
+#endif  // NET_QUIC_CORE_CRYPTO_CURVE25519_KEY_EXCHANGE_H_