ash: Remove ash::Shelf in favor of ash::WmShelf

ash/test/shelf_test_api.h

-// 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_TEST_SHELF_TEST_API_H_
-#define ASH_TEST_SHELF_TEST_API_H_
-
-#include "ash/common/shelf/shelf.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace test {
-
-// Use the api in this class to access private members of Shelf.
-class ShelfTestAPI {
- public:
-  explicit ShelfTestAPI(Shelf* shelf) : shelf_(shelf) {}
-  ~ShelfTestAPI() {}
-
-  WmShelf* wm_shelf() { return shelf_->wm_shelf_; }
-
-  ShelfView* shelf_view() { return shelf_->shelf_view_; }
-
- private:
-  Shelf* shelf_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShelfTestAPI);
-};
-
-}  // namespace test
-}  // namespace ash
-
-#endif  // ASH_TEST_SHELF_TEST_API_H_