mash: Move shelf model and item classes to ash/common/shelf

ash/shelf/shelf_view.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_SHELF_SHELF_VIEW_H_
 #define ASH_SHELF_SHELF_VIEW_H_
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 
+#include "ash/common/shelf/shelf_item_delegate.h"
+#include "ash/common/shelf/shelf_model_observer.h"
 #include "ash/shelf/shelf_button_pressed_metric_tracker.h"
-#include "ash/shelf/shelf_item_delegate.h"
-#include "ash/shelf/shelf_model_observer.h"
 #include "ash/shelf/shelf_tooltip_manager.h"
 #include "ash/wm/gestures/shelf_gesture_handler.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "ui/app_list/views/app_list_drag_and_drop_host.h"
 #include "ui/views/animation/bounds_animator_observer.h"
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/view.h"
@@ skipping 415 matching lines @@
 
   // Tracks UMA metrics based on shelf button press actions.
   ShelfButtonPressedMetricTracker shelf_button_pressed_metric_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_VIEW_H_