Fix ODR violations caused by mojoms being included in multiple components.

device/generic_sensor/platform_sensor_provider_linux.h

 // Copyright 2016 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_GENERIC_SENSOR_PUBLIC_PLATFORM_SENSOR_PROVIDER_LINUX_H_
 #define DEVICE_GENERIC_SENSOR_PUBLIC_PLATFORM_SENSOR_PROVIDER_LINUX_H_
 
 #include "device/generic_sensor/platform_sensor_provider.h"
 
+#include "device/generic_sensor/generic_sensor_export.h"
 #include "device/generic_sensor/linux/sensor_device_manager.h"
 
 namespace base {
 template <typename T>
 struct DefaultSingletonTraits;
 class Thread;
 }
 
 namespace device {
 
@@ skipping 91 matching lines @@
   // provider to stop a polling thread and passed to a manager that
   // runs a linux device monitor service on this task runner.
   scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformSensorProviderLinux);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_GENERIC_SENSOR_PUBLIC_PLATFORM_SENSOR_PROVIDER_LINUX_H_