Remove unnecessary "export" in PowerMonitorBroadcastSource

device/power_monitor/public/cpp/power_monitor_broadcast_source.h

Index: device/power_monitor/public/cpp/power_monitor_broadcast_source.h
diff --git a/device/power_monitor/public/cpp/power_monitor_broadcast_source.h b/device/power_monitor/public/cpp/power_monitor_broadcast_source.h
index 596d07b2721e227effb67cff72a46ab992079408..2a4c94a0957bc3de742003b8a0e92a3e878ef3e4 100644
--- a/device/power_monitor/public/cpp/power_monitor_broadcast_source.h
+++ b/device/power_monitor/public/cpp/power_monitor_broadcast_source.h
@@ -7,7 +7,6 @@
 
 #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"
@@ -16,9 +15,8 @@ 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);