mash: Move ownership of ShelfDelegate to WmShell

ash/test/shell_test_api.h

 // Copyright (c) 2012 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_SHELL_TEST_API_H_
 #define ASH_TEST_SHELL_TEST_API_H_
 
 #include "base/macros.h"
 
 namespace app_list {
@@ skipping 22 matching lines @@
   SystemGestureEventFilter* system_gesture_event_filter();
   WorkspaceController* workspace_controller();
   ScreenPositionController* screen_position_controller();
   AshNativeCursorManager* ash_native_cursor_manager();
   ShelfModel* shelf_model();
   DragDropController* drag_drop_controller();
   app_list::AppListPresenter* app_list_presenter();
   MaximizeModeWindowManager* maximize_mode_window_manager();
   void DisableDisplayAnimator();
 
-  // Set ShelfDelegate.
-  void SetShelfDelegate(ShelfDelegate* delegate);
-
   // Set SessionStateDelegate.
   void SetSessionStateDelegate(SessionStateDelegate* session_state_delegate);
 
  private:
   Shell* shell_;  // not owned
 
   DISALLOW_COPY_AND_ASSIGN(ShellTestApi);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_SHELL_TEST_API_H_