Fix net_export.h includes.

net/quic/core/quic_packet_generator.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.
 //
 // Responsible for generating packets on behalf of a QuicConnection.
 // Packets are serialized just-in-time.  Control frames are queued.
 // Ack and Feedback frames will be requested from the Connection
 // just-in-time.  When a packet needs to be sent, the Generator
 // will serialize a packet and pass it to QuicConnection::SendOrQueuePacket()
 //
@@ skipping 28 matching lines @@
 
 #ifndef NET_QUIC_QUIC_PACKET_GENERATOR_H_
 #define NET_QUIC_QUIC_PACKET_GENERATOR_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <list>
 
 #include "base/macros.h"
+#include "net/base/net_export.h"
 #include "net/quic/core/quic_packet_creator.h"
 #include "net/quic/core/quic_sent_packet_manager.h"
 #include "net/quic/core/quic_types.h"
 
 namespace net {
 
 namespace test {
 class QuicPacketGeneratorPeer;
 }  // namespace test
 
@@ skipping 154 matching lines @@
   // are referenced elsewhere so that they can later be (optionally)
   // retransmitted.
   QuicStopWaitingFrame pending_stop_waiting_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicPacketGenerator);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PACKET_GENERATOR_H_