Fix include guards for QUIC files.

net/quic/core/crypto/null_encrypter.h

Index: net/quic/core/crypto/null_encrypter.h
diff --git a/net/quic/core/crypto/null_encrypter.h b/net/quic/core/crypto/null_encrypter.h
index 5ea31eb67cf9af99e8a6cd646f57555c7e7ae567..af93c1aa1dcd6c0e39ac1b421b563aac254f69f3 100644
--- a/net/quic/core/crypto/null_encrypter.h
+++ b/net/quic/core/crypto/null_encrypter.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_NULL_ENCRYPTER_H_
-#define NET_QUIC_CRYPTO_NULL_ENCRYPTER_H_
+#ifndef NET_QUIC_CORE_CRYPTO_NULL_ENCRYPTER_H_
+#define NET_QUIC_CORE_CRYPTO_NULL_ENCRYPTER_H_
 
 #include <stddef.h>
 
@@ -47,4 +47,4 @@ class NET_EXPORT_PRIVATE NullEncrypter : public QuicEncrypter {
 
 }  // namespace net
 
-#endif  // NET_QUIC_CRYPTO_NULL_ENCRYPTER_H_
+#endif  // NET_QUIC_CORE_CRYPTO_NULL_ENCRYPTER_H_