Implement BluetoothGattNotifySession::Stop on Android, 2nd attempt

device/bluetooth/bluetooth_gatt_notify_session_android.cc

-// Copyright 2014 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 "device/bluetooth/bluetooth_gatt_notify_session_android.h"
-
-#include "base/logging.h"
-
-namespace device {
-
-BluetoothGattNotifySessionAndroid::BluetoothGattNotifySessionAndroid(
-    const std::string& characteristic_identifier)
-    : characteristic_id_(characteristic_identifier) {}
-
-BluetoothGattNotifySessionAndroid::~BluetoothGattNotifySessionAndroid() {}
-
-std::string BluetoothGattNotifySessionAndroid::GetCharacteristicIdentifier()
-    const {
-  return characteristic_id_;
-}
-
-bool BluetoothGattNotifySessionAndroid::IsActive() {
-  return true;
-}
-
-void BluetoothGattNotifySessionAndroid::Stop(const base::Closure& callback) {
-  NOTIMPLEMENTED();
-}
-
-}  // namespace device