[CrOS Tether] Add disconnect handling to NetworkConnectionHandler::TetherDelegate.

chromeos/components/tether/network_connection_handler_tether_delegate.h

 // Copyright 2017 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 CHROMEOS_COMPONENTS_TETHER_NETWORK_CONNECTION_HANDLER_TETHER_DELEGATE_H_
 #define CHROMEOS_COMPONENTS_TETHER_NETWORK_CONNECTION_HANDLER_TETHER_DELEGATE_H_
 
 #include "base/macros.h"
 #include "chromeos/network/network_connection_handler.h"
 
 namespace chromeos {
 
 class NetworkConnectionHandler;
 
 namespace tether {
 
 class TetherConnector;
 class TetherDisconnector;
 
 // Handles connect/disconnect requests for Tether networks.
 class NetworkConnectionHandlerTetherDelegate
     : public NetworkConnectionHandler::TetherDelegate {
  public:
   NetworkConnectionHandlerTetherDelegate(
       NetworkConnectionHandler* network_connection_handler,
       TetherConnector* tether_connector,
       TetherDisconnector* tether_disconnector);
   ~NetworkConnectionHandlerTetherDelegate() override;
 
-  // TODO(khorimoto): Add DisconnectFromNetwork to
-  // NetworkConnectionHandler::TetherDelegate and override it here.
+  // NetworkConnectionHandler::TetherDelegate:
   void DisconnectFromNetwork(
       const std::string& tether_network_guid,
       const base::Closure& success_callback,
-      const network_handler::StringResultCallback& error_callback);
-
-  // NetworkConnectionHandler::TetherDelegate:
+      const network_handler::StringResultCallback& error_callback) override;
   void ConnectToNetwork(
       const std::string& tether_network_guid,
       const base::Closure& success_callback,
       const network_handler::StringResultCallback& error_callback) override;
 
  private:
   NetworkConnectionHandler* network_connection_handler_;
   TetherConnector* tether_connector_;
   TetherDisconnector* tether_disconnector_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkConnectionHandlerTetherDelegate);
 };
 
 }  // namespace tether
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_COMPONENTS_TETHER_NETWORK_CONNECTION_HANDLER_TETHER_DELEGATE_H_