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

ash/common/shelf/shelf_item_types.h

Index: ash/common/shelf/shelf_item_types.h
diff --git a/ash/shelf/shelf_item_types.h b/ash/common/shelf/shelf_item_types.h
similarity index 93%
rename from ash/shelf/shelf_item_types.h
rename to ash/common/shelf/shelf_item_types.h
index 8d5ea8a7bb81c60d0aae742c9d285c0b4998907a..ac9e0864a62fea38dc8590c9194a7fe0f043ffc8 100644
--- a/ash/shelf/shelf_item_types.h
+++ b/ash/common/shelf/shelf_item_types.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SHELF_SHELF_ITEM_TYPES_H_
-#define ASH_SHELF_SHELF_ITEM_TYPES_H_
+#ifndef ASH_COMMON_SHELF_SHELF_ITEM_TYPES_H_
+#define ASH_COMMON_SHELF_SHELF_ITEM_TYPES_H_
 
 #include <vector>
 
@@ -93,4 +93,4 @@ struct ASH_EXPORT ShelfItemDetails {
 
 }  // namespace ash
 
-#endif  // ASH_SHELF_SHELF_ITEM_TYPES_H_
+#endif  // ASH_COMMON_SHELF_SHELF_ITEM_TYPES_H_