Fix include guards for QUIC files.

net/tools/quic/quic_simple_server_packet_writer.h

Index: net/tools/quic/quic_simple_server_packet_writer.h
diff --git a/net/tools/quic/quic_simple_server_packet_writer.h b/net/tools/quic/quic_simple_server_packet_writer.h
index 74e52b0091a41ea972eeca3c70edd1ba5a21121e..a08c0daf03ca70ad34f0c07b5b0b4c85cdaccc63 100644
--- a/net/tools/quic/quic_simple_server_packet_writer.h
+++ b/net/tools/quic/quic_simple_server_packet_writer.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_TOOLS_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_
-#define NET_QUIC_TOOLS_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_
+#ifndef NET_TOOLS_QUIC_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_
+#define NET_TOOLS_QUIC_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_
 
 #include <stddef.h>
 
@@ -73,4 +73,4 @@ class QuicSimpleServerPacketWriter : public QuicPacketWriter {
 
 }  // namespace net
 
-#endif  // NET_QUIC_TOOLS_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_
+#endif  // NET_TOOLS_QUIC_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_