Revert of mash: Fix MusPropertyMirrorAsh for owned properties; add test.

ash/common/shelf/shelf_item_types.cc

Index: ash/common/shelf/shelf_item_types.cc
diff --git a/ash/common/shelf/shelf_item_types.cc b/ash/common/shelf/shelf_item_types.cc
new file mode 100644
index 0000000000000000000000000000000000000000..36baad1d4588c89a8ddc2920d0ede2af568dc34d
--- /dev/null
+++ b/ash/common/shelf/shelf_item_types.cc
@@ -0,0 +1,13 @@
+// Copyright 2014 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/common/shelf/shelf_item_types.h"
+
+namespace ash {
+
+ShelfItem::ShelfItem() {}
+ShelfItem::ShelfItem(const ShelfItem& shelf_item) = default;
+ShelfItem::~ShelfItem() {}
+
+}  // namespace ash