Revert of Move //device/generic_sensor to be part of the internal implementation of the Device Service.

services/device/public/cpp/generic_sensor/sensor_reading.cc

-// 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.
-
-#include "services/device/public/cpp/generic_sensor/sensor_reading.h"
-
-namespace device {
-
-SensorReading::SensorReading() = default;
-SensorReading::SensorReading(const SensorReading& other) = default;
-SensorReading::~SensorReading() = default;
-
-SensorReadingSharedBuffer::SensorReadingSharedBuffer() = default;
-SensorReadingSharedBuffer::~SensorReadingSharedBuffer() = default;
-
-// static
-uint64_t SensorReadingSharedBuffer::GetOffset(mojom::SensorType type) {
-  return (static_cast<uint64_t>(mojom::SensorType::LAST) -
-          static_cast<uint64_t>(type)) *
-         sizeof(SensorReadingSharedBuffer);
-}
-
-}  // namespace device