Revert of [sensors] Ambient light sensor implementation for ChromeOS and Linux.

device/generic_sensor/platform_sensor_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_PLATFORM_SENSOR_LINUX_H_
-#define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_LINUX_H_
-
-#include "device/generic_sensor/platform_sensor.h"
-
-namespace base {
-class RepeatingTimer;
-class SingleThreadTaskRunner;
-class Thread;
-}
-
-namespace device {
-
-class SensorReader;
-struct SensorDataLinux;
-
-class PlatformSensorLinux : public PlatformSensor {
- public:
-  PlatformSensorLinux(
-      mojom::SensorType type,
-      mojo::ScopedSharedBufferMapping mapping,
-      PlatformSensorProvider* provider,
-      const SensorDataLinux& data,
-      std::unique_ptr<SensorReader> sensor_reader,
-      scoped_refptr<base::SingleThreadTaskRunner> polling_thread_task_runner);
-
-  // Thread safe.
-  mojom::ReportingMode GetReportingMode() override;
-
- protected:
-  ~PlatformSensorLinux() override;
-  bool StartSensor(const PlatformSensorConfiguration& configuration) override;
-  void StopSensor() override;
-  bool CheckSensorConfiguration(
-      const PlatformSensorConfiguration& configuration) override;
-  PlatformSensorConfiguration GetDefaultConfiguration() override;
-
- private:
-  void BeginPoll(const PlatformSensorConfiguration& configuration);
-  void StopPoll();
-
-  // Triggers |sensor_reader_| to read new sensor data.
-  // If new data is read, UpdateSensorReading() is called.
-  void PollForReadingData();
-
-  // Owned timer to be deleted on a polling thread.
-  base::RepeatingTimer* timer_;
-
-  const PlatformSensorConfiguration default_configuration_;
-  const mojom::ReportingMode reporting_mode_;
-
-  // A sensor reader that reads values from sensor files
-  // and stores them to a SensorReading structure.
-  std::unique_ptr<SensorReader> sensor_reader_;
-
-  // A task runner that is used to poll sensor data.
-  scoped_refptr<base::SingleThreadTaskRunner> polling_thread_task_runner_;
-
-  // Stores previously read values that are used to
-  // determine whether the recent values are changed
-  // and IPC can be notified that updates are available.
-  SensorReading old_values_;
-
-  base::WeakPtrFactory<PlatformSensorLinux> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(PlatformSensorLinux);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_LINUX_H_