mash: Avoid shelf crashes on display removal.

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"
@@ skipping 42 matching lines @@
                             display_bounds.height() - 20);
   display.set_work_area(work_area);
   window_tree_client_setup_.InitForWindowManager(
       window_manager_app_->window_manager_.get(),
       window_manager_app_->window_manager_.get(), display);
 
   window_manager_app_->InitWindowManager(
       window_tree_client_setup_.window_tree_client());
 
   screen_->display_list()->AddDisplay(display,
-                                      views::DisplayList::Type::PRIMARY);
+                                      display::DisplayList::Type::PRIMARY);
 
   ui::WindowTreeClientPrivate(window_tree_client_setup_.window_tree_client())
       .CallWmNewDisplayAdded(display);
 }
 
 }  // namespace mus
 }  // namespace ash