MD Settings: About page, add an explicit 'aboutPageReady' signal.

chrome/browser/resources/settings/about_page/detailed_build_info.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 'settings-detailed-build-info' contains detailed build
  * information for ChromeOS.
  */
 
 (function() {
@@ skipping 21 matching lines @@
     /** @private {!VersionInfo} */
     versionInfo_: Object,
 
     /** @private */
     currentlyOnChannelText_: String,
   },
 
   /** @override */
   ready: function() {
     var browserProxy = settings.AboutPageBrowserProxyImpl.getInstance();
-    browserProxy.refreshUpdateStatus();
+    browserProxy.pageReady();
 
     browserProxy.getVersionInfo().then(function(versionInfo) {
       this.versionInfo_ = versionInfo;
     }.bind(this));
     browserProxy.getCurrentChannel().then(function(channel) {
       this.currentlyOnChannelText_ = this.i18n(
           'aboutCurrentlyOnChannel',
           this.i18n(browserChannelToI18nId(channel)));
     }.bind(this));
   },
 
   /**
    * @param {string} version
    * @return {boolean}
    * @private
    */
   shouldShowVersion_: function(version) {
     return version.length > 0;
   },
 });
 
 })();