update polymer

dashboard-ui/bower_components/paper-checkbox/paper-checkbox.html

@@ -14,7 +14,9 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 <link rel="import" href="../paper-styles/color.html">
 <link rel="import" href="../paper-behaviors/paper-inky-focus-behavior.html">
 <link rel="import" href="../iron-checked-element-behavior/iron-checked-element-behavior.html">
+
 <!--
+Material design: [Checkbox](https://www.google.com/design/spec/components/selection-controls.html#selection-controls-checkbox)
 
 `paper-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
@@ -243,23 +245,6 @@ Custom property | Description | Default
 
       attached: function() {
         this._isReady = true;
-
-        // Don't stomp over a user-set aria-label.
-        if (!this.getAttribute('aria-label')) {
-          this.updateAriaLabel();
-        }
-      },
-
-      /**
-       * Update the checkbox aria-label. This is a temporary workaround not
-       * being able to observe changes in <content>
-       * (see: https://github.com/Polymer/polymer/issues/1773)
-       *
-       * Call this if you manually change the contents of the checkbox
-       * and want the aria-label to match the new contents.
-       */
-      updateAriaLabel: function() {
-        this.setAttribute('aria-label', Polymer.dom(this).textContent.trim());
       },
 
       // button-behavior hook