chromeos: converts DragImageViewTest to AshTestBase

ash/mus/window_manager.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.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 383 matching lines @@
                                        ui::mojom::PointerKind source) {
   if (drag_image.isNull())
     return;
 
   // TODO(erg): Get the right display for this drag image. Right now, none of
   // the drag drop code is multidisplay aware.
 
   // TODO(erg): SkBitmap is the wrong data type for the drag image; we should
   // be passing ImageSkias once http://crbug.com/655874 is implemented.
 
-  WmWindow* root_window =
-      WmWindow::Get((*GetRootWindowControllers().begin())->GetRootWindow());
+  aura::Window* root_window =
+      (*GetRootWindowControllers().begin())->GetRootWindow();
 
   ui::DragDropTypes::DragEventSource ui_source =
       source == ui::mojom::PointerKind::MOUSE
           ? ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE
           : ui::DragDropTypes::DRAG_EVENT_SOURCE_TOUCH;
   std::unique_ptr<DragImageView> drag_view =
       base::MakeUnique<DragImageView>(root_window, ui_source);
   drag_view->SetImage(gfx::ImageSkia::CreateFrom1xBitmap(drag_image));
   gfx::Size size = drag_view->GetPreferredSize();
   gfx::Rect drag_image_bounds(screen_location - drag_image_offset, size);
@@ skipping 144 matching lines @@
 bool WindowManager::IsWindowActive(aura::Window* window) {
   return Shell::Get()->activation_client()->GetActiveWindow() == window;
 }
 
 void WindowManager::OnWmDeactivateWindow(aura::Window* window) {
   Shell::Get()->activation_client()->DeactivateWindow(window);
 }
 
 }  // namespace mus
 }  // namespace ash