Fix include guards for QUIC files.

net/quic/core/crypto/curve25519_key_exchange.h

Index: net/quic/core/crypto/curve25519_key_exchange.h
diff --git a/net/quic/core/crypto/curve25519_key_exchange.h b/net/quic/core/crypto/curve25519_key_exchange.h
index 6f1bfe45db0045d567ec566e549845bad56595cb..c9e33bb9428b7fe60d07f98628c9c60f3eb8e46d 100644
--- a/net/quic/core/crypto/curve25519_key_exchange.h
+++ b/net/quic/core/crypto/curve25519_key_exchange.h
@@ -2,8 +2,8 @@
 // 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>
 
@@ -48,4 +48,4 @@ class NET_EXPORT_PRIVATE Curve25519KeyExchange : public KeyExchange {
 
 }  // namespace net
 
-#endif  // NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
+#endif  // NET_QUIC_CORE_CRYPTO_CURVE25519_KEY_EXCHANGE_H_