Bluetooth: macOS: Implement BluetoothRemoteGattCharacteristicMac::UnsubscribeFromNotifications

device/bluetooth/bluetooth_remote_gatt_characteristic_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_REMOTE_GATT_CHARACTERISTIC_MAC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_MAC_H_
 
 #include "device/bluetooth/bluetooth_remote_gatt_characteristic.h"
 
 #include <unordered_map>
@@ skipping 104 matching lines @@
   // Service UUID.
   BluetoothUUID uuid_;
   // Characteristic value.
   std::vector<uint8_t> value_;
   // True if a gatt read or write request is in progress.
   bool characteristic_value_read_or_write_in_progress_;
   // ReadRemoteCharacteristic request callbacks.
   std::pair<ValueCallback, ErrorCallback> read_characteristic_value_callbacks_;
   // WriteRemoteCharacteristic request callbacks.
   std::pair<base::Closure, ErrorCallback> write_characteristic_value_callbacks_;
-  // Stores SubscribeToNotifications request callbacks.
+  // Stores callbacks for SubscribeToNotifications and
+  // UnsubscribeFromNotifications requests.
   typedef std::pair<base::Closure, ErrorCallback> PendingNotifyCallbacks;
   // Stores SubscribeToNotifications request callbacks.
   PendingNotifyCallbacks subscribe_to_notification_callbacks_;
+  // Stores UnsubscribeFromNotifications request callbacks.
+  PendingNotifyCallbacks unsubscribe_from_notification_callbacks_;
   // Map of descriptors, keyed by descriptor identifier.
   std::unordered_map<std::string,
                      std::unique_ptr<BluetoothRemoteGattDescriptorMac>>
       gatt_descriptor_macs_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_MAC_H_