Remove unnecessary "export" in PowerMonitorBroadcastSource

device/power_monitor/public/cpp/power_monitor_broadcast_source.h

 // Copyright (c) 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 DEVICE_POWER_MONITOR_POWER_MONITOR_BROADCAST_SOURCE_H_
 #define DEVICE_POWER_MONITOR_POWER_MONITOR_BROADCAST_SOURCE_H_
 
 #include "base/macros.h"
 #include "base/power_monitor/power_monitor_source.h"
-#include "device/power_monitor/power_monitor_export.h"
 #include "device/power_monitor/public/interfaces/power_monitor.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/service_manager/public/cpp/interface_provider.h"
 
 namespace device {
 
 // Receives state changes from Power Monitor through mojo, and relays them to
 // the PowerMonitor of the current process.
-class DEVICE_POWER_MONITOR_EXPORT PowerMonitorBroadcastSource
-    : public base::PowerMonitorSource,
-      NON_EXPORTED_BASE(public device::mojom::PowerMonitorClient) {
+class PowerMonitorBroadcastSource : public base::PowerMonitorSource,
+                                    public device::mojom::PowerMonitorClient {
  public:
   explicit PowerMonitorBroadcastSource(
       service_manager::InterfaceProvider* interface_provider);
   ~PowerMonitorBroadcastSource() override;
 
   void PowerStateChange(bool on_battery_power) override;
   void Suspend() override;
   void Resume() override;
 
  private:
   bool IsOnBatteryPowerImpl() override;
   bool last_reported_battery_power_state_;
   mojo::Binding<device::mojom::PowerMonitorClient> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerMonitorBroadcastSource);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_POWER_MONITOR_POWER_MONITOR_BROADCAST_SOURCE_H_