Fix net_export.h includes.

net/quic/core/quic_sustained_bandwidth_recorder.h

 // Copyright 2014 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_SUSTAINED_BANDWIDTH_RECORDER_H_
 #define NET_QUIC_QUIC_SUSTAINED_BANDWIDTH_RECORDER_H_
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
+#include "net/base/net_export.h"
 #include "net/quic/core/quic_bandwidth.h"
 #include "net/quic/core/quic_time.h"
 
 namespace net {
 
 namespace test {
 class QuicSustainedBandwidthRecorderPeer;
 }  // namespace test
 
 // This class keeps track of a sustained bandwidth estimate to ultimately send
@@ skipping 62 matching lines @@
 
   // Timestamp marking the beginning of the latest recording period.
   QuicTime start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSustainedBandwidthRecorder);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SUSTAINED_BANDWIDTH_RECORDER_H_