Fix include guards for QUIC files.

net/quic/core/quic_packet_writer.h

 // Copyright 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_QUIC_PACKET_WRITER_H_
-#define NET_QUIC_QUIC_PACKET_WRITER_H_
+#ifndef NET_QUIC_CORE_QUIC_PACKET_WRITER_H_
+#define NET_QUIC_CORE_QUIC_PACKET_WRITER_H_
 
 #include <stddef.h>
 
 #include "net/base/net_export.h"
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/platform/api/quic_socket_address.h"
 
 namespace net {
 
 struct WriteResult;
@@ skipping 46 matching lines @@
 
   // Returns the maximum size of the packet which can be written using this
   // writer for the supplied peer address.  This size may actually exceed the
   // size of a valid QUIC packet.
   virtual QuicByteCount GetMaxPacketSize(
       const QuicSocketAddress& peer_address) const = 0;
 };
 
 }  // namespace net
 
-#endif  // NET_QUIC_QUIC_PACKET_WRITER_H_
+#endif  // NET_QUIC_CORE_QUIC_PACKET_WRITER_H_