Revert "chromeos: Move files in //ash/common to //ash, part 2"

ash/shelf/shelf_layout_manager_observer.h

Index: ash/shelf/shelf_layout_manager_observer.h
diff --git a/ash/shelf/shelf_layout_manager_observer.h b/ash/shelf/shelf_layout_manager_observer.h
deleted file mode 100644
index 8aac32dd8c8a685a954906316be5d4f3af3d859a..0000000000000000000000000000000000000000
--- a/ash/shelf/shelf_layout_manager_observer.h
+++ /dev/null
@@ -1,36 +0,0 @@
-// Copyright 2013 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_SHELF_SHELF_LAYOUT_MANAGER_OBSERVER_H_
-#define ASH_SHELF_SHELF_LAYOUT_MANAGER_OBSERVER_H_
-
-#include "ash/ash_export.h"
-#include "ash/public/cpp/shelf_types.h"
-#include "ash/shelf/shelf_background_animator.h"
-
-namespace ash {
-
-enum class AnimationChangeType;
-
-class ASH_EXPORT ShelfLayoutManagerObserver {
- public:
-  virtual ~ShelfLayoutManagerObserver() {}
-
-  // Called when the target ShelfLayoutManager will be deleted.
-  virtual void WillDeleteShelfLayoutManager() {}
-
-  // Called when the visibility change is scheduled.
-  virtual void WillChangeVisibilityState(ShelfVisibilityState new_state) {}
-
-  // Called when the auto hide state is changed.
-  virtual void OnAutoHideStateChanged(ShelfAutoHideState new_state) {}
-
-  // Called when shelf background animation is started.
-  virtual void OnBackgroundUpdated(ShelfBackgroundType background_type,
-                                   AnimationChangeType change_type) {}
-};
-
-}  // namespace ash
-
-#endif  // ASH_SHELF_SHELF_LAYOUT_MANAGER_OBSERVER_H_