Fix BluetoothConnection to disconnect when the underlying device disconnects.

components/proximity_auth/bluetooth_connection.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 COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_H
 #define COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_H
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 26 matching lines @@
 
   // Connection:
   void Connect() override;
   void Disconnect() override;
 
  protected:
   // Connection:
   void SendMessageImpl(scoped_ptr<WireMessage> message) override;
 
   // BluetoothAdapter::Observer:
+  void DeviceChanged(device::BluetoothAdapter* adapter,
+                     device::BluetoothDevice* device) override;
   void DeviceRemoved(device::BluetoothAdapter* adapter,
                      device::BluetoothDevice* device) override;
 
  private:
   // Registers receive callbacks with the backing |socket_|.
   void StartReceive();
 
   // Callbacks for asynchronous Bluetooth operations.
   void OnAdapterInitialized(scoped_refptr<device::BluetoothAdapter> adapter);
   void OnConnected(scoped_refptr<device::BluetoothSocket> socket);
@@ skipping 21 matching lines @@
   scoped_ptr<WireMessage> pending_message_;
 
   base::WeakPtrFactory<BluetoothConnection> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothConnection);
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_H