mash: Remove ShelfDelegate; move functions to ShelfModel.

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 <memory>
 
 #include "base/macros.h"
 
 namespace ash {
 class AshNativeCursorManager;
 class DragDropController;
 class MaximizeModeWindowManager;
 class PaletteDelegate;
 class SessionStateDelegate;
 class ScreenPositionController;
-class ShelfDelegate;
 class Shell;
 class SystemGestureEventFilter;
 class WorkspaceController;
 
 namespace test {
 
 // Accesses private data from a Shell for testing.
 class ShellTestApi {
  public:
   ShellTestApi();
   explicit ShellTestApi(Shell* shell);
 
   SystemGestureEventFilter* system_gesture_event_filter();
   WorkspaceController* workspace_controller();
   ScreenPositionController* screen_position_controller();
   AshNativeCursorManager* ash_native_cursor_manager();
   DragDropController* drag_drop_controller();
   MaximizeModeWindowManager* maximize_mode_window_manager();
 
   void SetPaletteDelegate(std::unique_ptr<PaletteDelegate> palette_delegate);
   void SetSessionStateDelegate(SessionStateDelegate* session_state_delegate);
-  void SetShelfDelegate(std::unique_ptr<ShelfDelegate> test_delegate);
 
  private:
   Shell* shell_;  // not owned
 
   DISALLOW_COPY_AND_ASSIGN(ShellTestApi);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_SHELL_TEST_API_H_