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

chromeos/network/network_connect_unittest.cc

 // Copyright (c) 2013 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.
 
 #include "chromeos/network/network_connect.h"
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 57 matching lines @@
   }
 
   // NetworkConnectionHandler::TetherDelegate:
   void ConnectToNetwork(
       const std::string& tether_network_guid,
       const base::Closure& success_callback,
       const network_handler::StringResultCallback& error_callback) override {
     last_connected_tether_network_guid_ = tether_network_guid;
     success_callback.Run();
   }
+  void DisconnectFromNetwork(
+      const std::string& tether_network_guid,
+      const base::Closure& success_callback,
+      const network_handler::StringResultCallback& error_callback) override {}
 
  private:
   std::string last_connected_tether_network_guid_;
 };
 
 }  // namespace
 
 class NetworkConnectTest : public testing::Test {
  public:
   NetworkConnectTest() {}
@@ skipping 286 matching lines @@
       kCellular1DevicePath, shill::kSIMPresentProperty, base::Value(true));
   device_test_->SetSimLocked(kCellular1DevicePath, false);
 
   base::RunLoop().RunUntilIdle();
 
   NetworkConnect::Get()->SetTechnologyEnabled(NetworkTypePattern::Cellular(),
                                               true);
 }
 
 }  // namespace chromeos