mash: Move ownership of ShelfDelegate to WmShell

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/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_; }
 
-  void set_delegate(ShelfDelegate* delegate) { shelf_->delegate_ = delegate; }
-
  private:
   Shelf* shelf_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfTestAPI);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_SHELF_TEST_API_H_