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

ash/shelf/shelf_unittest.cc

 // 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.
 
 #include "ash/shelf/shelf.h"
 
 #include <utility>
 
+#include "ash/common/shelf/shelf_item_delegate_manager.h"
+#include "ash/common/shelf/shelf_model.h"
 #include "ash/shelf/shelf_button.h"
-#include "ash/shelf/shelf_item_delegate_manager.h"
-#include "ash/shelf/shelf_model.h"
 #include "ash/shelf/shelf_view.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/shelf_test_api.h"
 #include "ash/test/shelf_view_test_api.h"
 #include "ash/test/test_shelf_item_delegate.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/views/view.h"
@@ skipping 132 matching lines @@
 
   // Removes the first item in main shelf view.
   shelf_model()->RemoveItemAt(shelf_model()->ItemIndexByID(first_item_id));
 
   // Waits for all transitions to finish and there should be no crash.
   test_api()->RunMessageLoopUntilAnimationsDone();
   EXPECT_FALSE(shelf()->IsShowingOverflowBubble());
 }
 
 }  // namespace ash