mash: Port ash_sysui ShelfDelegateMus impl to mojo:ash.

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/material_design/material_design_controller.h"
 #include "ash/common/test/material_design_controller_test_api.h"
 #include "ash/mus/root_window_controller.h"
 #include "ash/mus/test/wm_test_screen.h"
 #include "ash/mus/window_manager.h"
 #include "ash/mus/window_manager_application.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "services/ui/public/cpp/property_type_converters.h"
 #include "services/ui/public/cpp/tests/window_tree_client_private.h"
 #include "services/ui/public/cpp/window_tree_client.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/test/material_design_controller_test_api.h"
 #include "ui/display/display.h"
 
 namespace ash {
 namespace mus {
 
 WmTestHelper::WmTestHelper() {}
 
 WmTestHelper::~WmTestHelper() {
+  window_manager_app_.window_manager_.reset();
   ash::test::MaterialDesignControllerTestAPI::Uninitialize();
   ui::test::MaterialDesignControllerTestAPI::Uninitialize();
 }
 
 void WmTestHelper::Init() {
   ui::MaterialDesignController::Initialize();
   ash::MaterialDesignController::Initialize();
 
   message_loop_.reset(new base::MessageLoopForUI());
   window_manager_app_.window_manager_.reset(new WindowManager(nullptr));
@@ skipping 18 matching lines @@
 
   screen_->display_list()->AddDisplay(display,
                                       views::DisplayList::Type::PRIMARY);
 
   ui::WindowTreeClientPrivate(window_tree_client_setup_.window_tree_client())
       .CallWmNewDisplayAdded(display);
 }
 
 }  // namespace mus
 }  // namespace ash