mash: Remove shelf util functions; use WmWindow properties.

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
deleted file mode 100644
index 04f4f21d032503f482c9949df0589d27a5b4e725..0000000000000000000000000000000000000000
--- a/ash/common/shelf/shelf_item_types.cc
+++ /dev/null
@@ -1,21 +0,0 @@
-// 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"
-
-#include "ash/common/shelf/shelf_constants.h"
-
-namespace ash {
-
-ShelfItem::ShelfItem()
-    : type(TYPE_UNDEFINED), id(kInvalidShelfID), status(STATUS_CLOSED) {}
-
-ShelfItem::~ShelfItem() {}
-
-ShelfItemDetails::ShelfItemDetails()
-    : type(TYPE_UNDEFINED), image_resource_id(kInvalidImageResourceID) {}
-
-ShelfItemDetails::~ShelfItemDetails() {}
-
-}  // namespace ash