Moves ToastManager from Shell to WmShell

ui/arc/notification/arc_notification_manager.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 "ui/arc/notification/arc_notification_manager.h"
 
 #include "ash/common/system/toast/toast_manager.h"
-#include "ash/shell.h"
+#include "ash/common/wm_shell.h"
 #include "base/memory/ptr_util.h"
 #include "base/stl_util.h"
 #include "ui/arc/notification/arc_custom_notification_item.h"
 #include "ui/arc/notification/arc_notification_item.h"
 
 namespace arc {
 
 ArcNotificationManager::ArcNotificationManager(ArcBridgeService* bridge_service,
                                                const AccountId& main_profile_id)
     : ArcNotificationManager(bridge_service,
@@ skipping 166 matching lines @@
     default:
       VLOG(3) << "Invalid button index (key: " << key
               << ", index: " << button_index << ").";
       return;
   }
 
   notifications_instance->SendNotificationEventToAndroid(key, command);
 }
 
 void ArcNotificationManager::OnToastPosted(mojom::ArcToastDataPtr data) {
-  ash::Shell::GetInstance()->toast_manager()->Show(
+  ash::WmShell::Get()->toast_manager()->Show(
       ash::ToastData(data->id, data->text, data->duration, data->dismiss_text));
 }
 
 void ArcNotificationManager::OnToastCancelled(mojom::ArcToastDataPtr data) {
-  ash::Shell::GetInstance()->toast_manager()->Cancel(data->id);
+  ash::WmShell::Get()->toast_manager()->Cancel(data->id);
 }
 
 }  // namespace arc