Revert of Device Orientation API on Chrome OS

content/browser/device_sensors/sensor_manager_chromeos.h

-// Copyright 2015 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 CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
-#define CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
-
-#include "base/macros.h"
-#include "base/synchronization/lock.h"
-#include "chromeos/accelerometer/accelerometer_reader.h"
-#include "chromeos/accelerometer/accelerometer_types.h"
-#include "content/common/content_export.h"
-#include "content/common/device_sensors/device_orientation_hardware_buffer.h"
-
-namespace content {
-
-// Observes Chrome OS accelerometer sensors, and provides updated device
-// orientation information.
-class CONTENT_EXPORT SensorManagerChromeOS
-    : public chromeos::AccelerometerReader::Observer {
- public:
-  SensorManagerChromeOS();
-  ~SensorManagerChromeOS() override;
-
-  // Begins monitoring of orientation events, the shared memory of |buffer| will
-  // be updated upon subsequent events.
-  bool StartFetchingDeviceOrientationData(
-      DeviceOrientationHardwareBuffer* buffer);
-
-  // Stops monitoring orientation events. Returns true if there is an active
-  // |orientation_buffer_| and fetching stops. Otherwise returns false.
-  bool StopFetchingDeviceOrientationData();
-
-  // chromeos::AccelerometerReader::Observer:
-  void OnAccelerometerUpdated(
-      const chromeos::AccelerometerUpdate& update) override;
-
- protected:
-  // Begins/ends the observation of accelerometer events.
-  virtual void StartObservingAccelerometer();
-  virtual void StopObservingAccelerometer();
-
- private:
-  // Shared memory to update.
-  DeviceOrientationHardwareBuffer* orientation_buffer_;
-
-  // Synchronize orientation_buffer_ across threads.
-  base::Lock orientation_buffer_lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(SensorManagerChromeOS);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_