device/bluetooth: Update GATT descriptor value D-Bus bindings.

device/bluetooth/bluetooth_remote_gatt_service_chromeos.h

 // 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.
 
 #ifndef DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_SERVICE_CHROMEOS_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_SERVICE_CHROMEOS_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 71 matching lines @@
   // by BluetoothRemoteGattCharacteristicChromeOS instances to notify service
   // observers when characteristic descriptors get added and removed. If |added|
   // is true, an "Added" event will be sent. Otherwise, a "Removed" event will
   // be sent.
   void NotifyDescriptorAddedOrRemoved(
       BluetoothRemoteGattCharacteristicChromeOS* characteristic,
       BluetoothRemoteGattDescriptorChromeOS* descriptor,
       bool added);
 
   // Notifies its observers that the value of a descriptor has changed. Called
-  // by BluetoothRemoteGattCharacteristicChromeOS instances to notify service
-  // observers when the value of one of their descriptors gets updated.
+  // by BluetoothRemoteGattDescriptorChromeOS instances to notify service
+  // observers when their cached value gets updated after a read request.
   void NotifyDescriptorValueChanged(
       BluetoothRemoteGattCharacteristicChromeOS* characteristic,
       BluetoothRemoteGattDescriptorChromeOS* descriptor,
       const std::vector<uint8>& value);
 
  private:
   friend class BluetoothDeviceChromeOS;
 
   BluetoothRemoteGattServiceChromeOS(BluetoothDeviceChromeOS* device,
                                      const dbus::ObjectPath& object_path);
@@ skipping 30 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothRemoteGattServiceChromeOS> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothRemoteGattServiceChromeOS);
 };
 
 }  // namespace chromeos
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_SERVICE_CHROMEOS_H_