Implement BluetoothGattNotifySession::Stop on Android, 2nd attempt

device/bluetooth/bluetooth_gatt_notify_session_mac.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_BLUETOOTH_BLUETOOTH_GATT_NOTIFY_SESSION_MAC_H_
-#define DEVICE_BLUETOOTH_BLUETOOTH_GATT_NOTIFY_SESSION_MAC_H_
-
-#include "device/bluetooth/bluetooth_gatt_notify_session.h"
-
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h"
-
-namespace device {
-class DEVICE_BLUETOOTH_EXPORT BluetoothGattNotifySessionMac
-    : public BluetoothGattNotifySession {
- public:
-  BluetoothGattNotifySessionMac(
-      base::WeakPtr<BluetoothRemoteGattCharacteristicMac> characteristic);
-  ~BluetoothGattNotifySessionMac() override;
-
-  // Override BluetoothGattNotifySession interfaces.
-  std::string GetCharacteristicIdentifier() const override;
-  bool IsActive() override;
-  void Stop(const base::Closure& callback) override;
-
- private:
-  base::WeakPtr<BluetoothRemoteGattCharacteristicMac> characteristic_;
-
-  DISALLOW_COPY_AND_ASSIGN(BluetoothGattNotifySessionMac);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_BLUETOOTH_BLUETOOTH_GATT_NOTIFY_SESSION_MAC_H_