Remove Polymer 0.5.

ui/webui/resources/cr_elements/cr_expand_button/cr_expand_button.js

-// Copyright 2015 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.
-
-/**
- * @fileoverview
- * 'cr-expand-button' is a chrome-specific wrapper around paper-button that
- * toggles between an opened (expanded) and closed state.
- *
- * Example:
- *
- *    <cr-expand-button expanded="{{sectionIsExpanded}}"></cr-expand-button>
- *
- * @group Chrome Elements
- * @element cr-expand-button
- */
-Polymer('cr-expand-button', {
-  publish: {
-    /**
-     * If true, the button is in the expanded state and will show the
-     * 'expand-less' icon. If false, the button shows the 'expand-more' icon.
-     *
-     * @attribute expanded
-     * @type {boolean}
-     * @default false
-     */
-    expanded: false,
-
-    /**
-     * If true, the button will be disabled and greyed out.
-     *
-     * @attribute disabled
-     * @type {boolean}
-     * @default false
-     */
-    disabled: {value: false, reflect: true},
-  },
-});