Move common cr-policy-indicator behavior into CrPolicyIndicatorBehavior

chrome/browser/resources/settings/controls/controlled_radio_button.js

 // Copyright 2016 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.
 
 Polymer({
   is: 'controlled-radio-button',
 
   behaviors: [PrefControlBehavior],
 
   properties: {
@@ skipping 18 matching lines @@
    * @return {boolean} Whether the button is disabled.
    * @private
    */
   computeControlled_: function() {
     return this.pref.enforcement == chrome.settingsPrivate.Enforcement.ENFORCED;
   },
 
   /**
    * @param {boolean} controlled
    * @param {string} name
-   * @param {chrome.settingsPrivate.PrefObject} pref
    * @return {boolean}
    * @private
    */
-  showIndicator_: function(controlled, name, pref) {
-    return controlled && name == Settings.PrefUtil.prefToString(pref);
+  showIndicator_: function(controlled, name) {
+    return controlled &&
+        name == Settings.PrefUtil.prefToString(assert(this.pref));
   },
 
   /**
    * @param {!Event} e
    * @private
    */
   onIndicatorTap_: function(e) {
     // Disallow <controlled-radio-button on-tap="..."> when controlled.
     e.preventDefault();
     e.stopPropagation();
   },
 
   /** Focuses the internal radio button when the row is selected. */
   onFocus_: function() {
     this.$.radioButton.focus();
   },
 });