Fix include guards for QUIC files.

net/quic/core/quic_constants.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_QUIC_CONSTANTS_H_
-#define NET_QUIC_QUIC_CONSTANTS_H_
+#ifndef NET_QUIC_CORE_QUIC_CONSTANTS_H_
+#define NET_QUIC_CORE_QUIC_CONSTANTS_H_
 
 #include <stddef.h>
 #include <cstdint>
 #include <limits>
 
 #include "base/macros.h"
 #include "net/quic/core/quic_types.h"
 
 // Definitions of constant values used throughout the QUIC code.
 
@@ skipping 160 matching lines @@
 // may set in the packet header to ensure that its INITIAL keys are not
 // duplicated.
 const size_t kDiversificationNonceSize = 32;
 
 // The largest gap in packets we'll accept without closing the connection.
 // This will likely have to be tuned.
 const QuicPacketNumber kMaxPacketGap = 5000;
 
 }  // namespace net
 
-#endif  // NET_QUIC_QUIC_CONSTANTS_H_
+#endif  // NET_QUIC_CORE_QUIC_CONSTANTS_H_