mash: Use ash shell window container ids instead of ash::mojom::Container

ash/mus/container_ids.h

Index: ash/mus/container_ids.h
diff --git a/ash/mus/container_ids.h b/ash/mus/container_ids.h
deleted file mode 100644
index 4fa2b84831cb9e2d5dcfc2724ab81cbef8c0e163..0000000000000000000000000000000000000000
--- a/ash/mus/container_ids.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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.
-
-#ifndef ASH_MUS_CONTAINER_IDS_H_
-#define ASH_MUS_CONTAINER_IDS_H_
-
-#include <stddef.h>
-
-namespace ash {
-namespace mojom {
-enum class Container;
-}
-
-namespace mus {
-
-// Converts a Container to a shell window ids (ash/common/shell_window_ids.h).
-int MashContainerToAshShellWindowId(mojom::Container container);
-
-}  // namespace mus
-}  // namespace ash
-
-#endif  // ASH_MUS_CONTAINER_IDS_H_