Converts ash to use aura-mus

ash/mus/screenlock_layout.h

Index: ash/mus/screenlock_layout.h
diff --git a/ash/mus/screenlock_layout.h b/ash/mus/screenlock_layout.h
deleted file mode 100644
index 1b43bc685bbf2fb97253a127df19ef9f71a21084..0000000000000000000000000000000000000000
--- a/ash/mus/screenlock_layout.h
+++ /dev/null
@@ -1,30 +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_SCREENLOCK_LAYOUT_H_
-#define ASH_MUS_SCREENLOCK_LAYOUT_H_
-
-#include "ash/mus/layout_manager.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace mus {
-
-// Lays out the shelf within shelf containers.
-class ScreenlockLayout : public LayoutManager {
- public:
-  explicit ScreenlockLayout(ui::Window* owner);
-  ~ScreenlockLayout() override;
-
- private:
-  // Overridden from LayoutManager:
-  void LayoutWindow(ui::Window* window) override;
-
-  DISALLOW_COPY_AND_ASSIGN(ScreenlockLayout);
-};
-
-}  // namespace mus
-}  // namespace ash
-
-#endif  // ASH_MUS_SCREENLOCK_LAYOUT_H_