Makes AshTestHelper shutdown ChromeOS NetworkHandler

ash/mus/test/wm_test_helper.cc

 // 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.
 
 #include "ash/mus/test/wm_test_helper.h"
 
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/mus/screen_mus.h"
 #include "ash/mus/window_manager.h"
@@ skipping 90 matching lines @@
 
   window_manager_app_->window_manager_.reset(new WindowManager(nullptr));
   window_manager_app_->window_manager()->shell_delegate_for_test_ =
       base::MakeUnique<test::TestShellDelegate>();
 
   window_tree_client_setup_.InitForWindowManager(
       window_manager_app_->window_manager_.get(),
       window_manager_app_->window_manager_.get());
   aura::test::EnvTestHelper().SetWindowTreeClient(
       window_tree_client_setup_.window_tree_client());
+  // See comment in AshTestHelper for details on why NetworkHandler is not
+  // initialized.
+  const bool init_network_handler = false;
   window_manager_app_->InitWindowManager(
       window_tree_client_setup_.OwnWindowTreeClient(),
-      blocking_pool_owner_->pool());
+      blocking_pool_owner_->pool(), init_network_handler);
 
   aura::WindowTreeClient* window_tree_client =
       window_manager_app_->window_manager()->window_tree_client();
   window_tree_client_private_ =
       base::MakeUnique<aura::WindowTreeClientPrivate>(window_tree_client);
   int next_x = 0;
   CreateRootWindowController("800x600", &next_x);
 }
 
 std::vector<RootWindowController*> WmTestHelper::GetRootsOrderedByDisplayId() {
@@ skipping 60 matching lines @@
   const bool is_primary =
       screen->display_list().FindDisplayById(updated_display.id()) ==
       screen->display_list().GetPrimaryDisplayIterator();
   screen->display_list().UpdateDisplay(
       updated_display, is_primary ? display::DisplayList::Type::PRIMARY
                                   : display::DisplayList::Type::NOT_PRIMARY);
 }
 
 }  // namespace mus
 }  // namespace ash