Invoke GattDiscoveryCompleteForService by observing ServicesResolved property

device/bluetooth/bluez/bluetooth_remote_gatt_service_bluez.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_BLUEZ_BLUETOOTH_REMOTE_GATT_SERVICE_BLUEZ_H_
 #define DEVICE_BLUETOOTH_BLUEZ_BLUETOOTH_REMOTE_GATT_SERVICE_BLUEZ_H_
 
 #include <stdint.h>
+
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "dbus/object_path.h"
 #include "device/bluetooth/bluetooth_remote_gatt_service.h"
 #include "device/bluetooth/bluetooth_uuid.h"
 #include "device/bluetooth/bluez/bluetooth_gatt_service_bluez.h"
@@ skipping 85 matching lines @@
   // this map. See crbug.com/604166.
   using CharacteristicMap =
       std::map<dbus::ObjectPath, BluetoothRemoteGattCharacteristicBlueZ*>;
 
   // Mapping from GATT characteristic object paths to characteristic objects.
   // owned by this service. Since the BlueZ implementation uses object
   // paths as unique identifiers, we also use this mapping to return
   // characteristics by identifier.
   CharacteristicMap characteristics_;
 
-  // Indicates whether or not the characteristics of this service are known to
-  // have been discovered.
-  bool discovery_complete_;
-
   // 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<BluetoothRemoteGattServiceBlueZ> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothRemoteGattServiceBlueZ);
 };
 
 }  // namespace bluez
 
 #endif  // DEVICE_BLUETOOTH_BLUEZ_BLUETOOTH_REMOTE_GATT_SERVICE_BLUEZ_H_