Makes AshTestHelper shutdown ChromeOS NetworkHandler

ash/mus/window_manager_application.cc

 // Copyright 2015 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 "ash/mus/window_manager_application.h"
 
 #include <utility>
 
 #include "ash/common/mojo_interface_factory.h"
 #include "ash/common/system/chromeos/power/power_status.h"
@@ skipping 81 matching lines @@
   chromeos::NetworkConnect::Initialize(network_connect_delegate_.get());
   // TODO(jamescook): Initialize real audio handler.
   chromeos::CrasAudioHandler::InitializeForTesting();
 }
 
 void WindowManagerApplication::ShutdownComponents() {
   // NOTE: PowerStatus is shutdown by Shell.
   chromeos::CrasAudioHandler::Shutdown();
   chromeos::NetworkConnect::Shutdown();
   network_connect_delegate_.reset();
-  chromeos::NetworkHandler::Shutdown();
+  // Tests may explicitly shutdown the NetworkHandler.
+  if (chromeos::NetworkHandler::IsInitialized())
+    chromeos::NetworkHandler::Shutdown();
   device::BluetoothAdapterFactory::Shutdown();
   bluez::BluezDBusManager::Shutdown();
   chromeos::DBusThreadManager::Shutdown();
   message_center::MessageCenter::Shutdown();
 }
 
 void WindowManagerApplication::OnStart() {
   aura_init_ = base::MakeUnique<views::AuraInit>(
       context()->connector(), context()->identity(), "ash_mus_resources.pak",
       "ash_mus_resources_200.pak", nullptr,
@@ skipping 18 matching lines @@
     const service_manager::ServiceInfo& remote_info,
     service_manager::InterfaceRegistry* registry) {
   // Register services used in both classic ash and mash.
   mojo_interface_factory::RegisterInterfaces(
       registry, base::ThreadTaskRunnerHandle::Get());
   return true;
 }
 
 }  // namespace mus
 }  // namespace ash