arc: Handle ARC events in MD Settings

chrome/browser/resources/settings/android_apps_page/android_apps_page.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.
 
 /**
  * @fileoverview
  * 'android-apps-page' is the settings page for enabling android apps.
  */
 
 Polymer({
@@ skipping 20 matching lines @@
             settings.Route.ANDROID_APPS_DETAILS.path,
             '#android-apps .subpage-arrow');
         return map;
       },
     },
   },
 
   /** @private {?settings.AndroidAppsBrowserProxy} */
   browserProxy_: null,
 
+  /** @private {?WebUIListener} */
+  listener_: null,
+
   /** @override */
   created: function() {
     this.browserProxy_ = settings.AndroidAppsBrowserProxyImpl.getInstance();
   },
 
   /** @override */
-  ready: function() {
-    cr.addWebUIListener(
+  attached: function() {
+    this.listener_ = cr.addWebUIListener(
         'android-apps-info-update', this.androidAppsInfoUpdate_.bind(this));
     this.browserProxy_.requestAndroidAppsInfo();
   },
+
+  /** @override */
+  detached: function() {
+    cr.removeWebUIListener(this.listener_);
+  },
+
   /**
    * @param {AndroidAppsInfo} info
    * @private
    */
   androidAppsInfoUpdate_: function(info) {
     this.androidAppsInfo_ = info;
   },
 
   /**
    * @param {Event} event
    * @private
    */
   onEnableTap_: function(event) {
     this.setPrefValue('arc.enabled', true);
     event.stopPropagation();
   },
 
   /** @private */
   onSubpageTap_: function() {
-    if (this.androidAppsInfo_.appReady)
+    if (this.androidAppsInfo_.playStoreEnabled)
       settings.navigateTo(settings.Route.ANDROID_APPS_DETAILS);
   },
 });