Adds missing include.

net/quic/quartc/quartc_factory_interface.h

 // Copyright (c) 2017 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_QUARTC_QUARTC_FACTORY_INTERFACE_H_
 #define NET_QUIC_QUARTC_QUARTC_FACTORY_INTERFACE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 
+#include "net/quic/platform/api/quic_export.h"
 #include "net/quic/quartc/quartc_clock_interface.h"
 #include "net/quic/quartc/quartc_session_interface.h"
 #include "net/quic/quartc/quartc_task_runner_interface.h"
 
 namespace net {
 
 // Algorithm to use for congestion control.
 enum class QuartcCongestionControl {
   kDefault,  // Use an arbitrary algorithm chosen by QUIC.
   kBBR,      // Use BBR.
@@ skipping 45 matching lines @@
   bool create_at_exit_manager = true;
 };
 
 // Creates a new instance of QuartcFactoryInterface.
 std::unique_ptr<QuartcFactoryInterface> CreateQuartcFactory(
     const QuartcFactoryConfig& factory_config);
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUARTC_QUARTC_FACTORY_INTERFACE_H_