Removes WmShelfAura and WmShelfMus

ash/mus/bridge/wm_shelf_mus.h

Index: ash/mus/bridge/wm_shelf_mus.h
diff --git a/ash/mus/bridge/wm_shelf_mus.h b/ash/mus/bridge/wm_shelf_mus.h
deleted file mode 100644
index 9a2726fc120f0df592522f792cf9ef695af85a31..0000000000000000000000000000000000000000
--- a/ash/mus/bridge/wm_shelf_mus.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_BRIDGE_WM_SHELF_MUS_H_
-#define ASH_MUS_BRIDGE_WM_SHELF_MUS_H_
-
-#include "ash/common/shelf/wm_shelf.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace mus {
-
-// WmShelf implementation for mus.
-class WmShelfMus : public WmShelf {
- public:
-  WmShelfMus();
-  ~WmShelfMus() override;
-
-  // WmShelf:
-  void WillDeleteShelfLayoutManager() override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(WmShelfMus);
-};
-
-}  // namespace mus
-}  // namespace ash
-
-#endif  // ASH_MUS_BRIDGE_WM_SHELF_MUS_H_