[MD settings][cros accounts] Updates the accounts page according to the specs

chrome/browser/resources/settings/people_page/sync_page.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.
 
 (function() {
 
 /**
  * Names of the radio buttons which allow the user to choose their encryption
  * mechanism.
  * @enum {string}
@@ skipping 147 matching lines @@
   },
 
   /** @override */
   detached: function() {
     if (settings.getCurrentRoute() == settings.Route.SYNC)
       this.onNavigateAwayFromPage_();
   },
 
   /** @protected */
   currentRouteChanged: function() {
-    if (!this.isAttached)
-      return;
-
     if (settings.getCurrentRoute() == settings.Route.SYNC)
       this.onNavigateToPage_();
     else
       this.onNavigateAwayFromPage_();
   },
 
   /**
    * @param {!settings.PageStatus} expectedPageStatus
    * @return {boolean}
    * @private
    */
   isStatus_: function(expectedPageStatus) {
     return expectedPageStatus == this.pageStatus_;
   },
 
   /** @private */
   onNavigateToPage_: function() {
-    // The element is not ready for C++ interaction until it is attached.
-    assert(this.isAttached);
     assert(settings.getCurrentRoute() == settings.Route.SYNC);
 
     if (this.unloadCallback_)
       return;
 
     // Display loading page until the settings have been retrieved.
     this.pageStatus_ = settings.PageStatus.SPINNER;
 
     this.browserProxy_.didNavigateToSyncPage();
 
@@ skipping 221 matching lines @@
 
     this.$$('#passphraseInput').invalid = emptyPassphrase;
     this.$$('#passphraseConfirmationInput').invalid =
         !emptyPassphrase && mismatchedPassphrase;
 
     return !emptyPassphrase && !mismatchedPassphrase;
   },
 });
 
 })();