[MD settings] updating polymer to 1.1.13

ui/webui/resources/cr_elements/v1_0/cr_checkbox/cr_checkbox.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-checkbox` is a button that can be either checked or unchecked. User
  * can tap the checkbox to check or uncheck it. Usually you use checkboxes
  * to allow user to select multiple options from a set. If you have a single
  * ON/OFF option, avoid using a single checkbox and use `cr-toggle-button`
@@ skipping 22 matching lines @@
     /**
      * If true, the user cannot interact with this element.
      */
     disabled: {
       type: Boolean,
       value: false,
       reflectToAttribute: true
     },
   },
 
-  /** @override */
-  attached: function() {
-    // HACK(dschuyler): paper-checkbox 1.0.6 will hide the label
-    // if the content is empty.
-    // TODO(dschuyler): rework settings checkbox to use content
-    // rather than spans.
-    this.$.checkbox.$.checkboxLabel.hidden = false;
-  },
-
   toggle: function() {
     this.checked = !this.checked;
   },
 
   /** @override */
   ready: function() {
+    this.ariaHidden = true;

[Jeremy Klein, 2015/09/10 21:19:51]

Why this? Do we intentionally want to hide this checkbox from screen readers?

[dschuyler, 2015/09/10 21:23:05]

That should not have been checked in.  Thanks for catching that.

Done.

     this.$.events.forward(this.$.checkbox, ['change']);
   },
 });