Migrate <cr-dialog> from PaperDialogBehavior to native <dialog>.

chrome/browser/resources/settings/people_page/people_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.
 
 /**
  * @fileoverview
  * 'settings-people-page' is the settings page containing sign-in settings.
  */
 Polymer({
   is: 'settings-people-page',
@@ skipping 192 matching lines @@
     this.syncBrowserProxy_.openActivityControlsUrl();
   },
 
   /** @private */
   onSigninTap_: function() {
     this.syncBrowserProxy_.startSignIn();
   },
 
   /** @private */
   onDisconnectTap_: function() {
-    this.$.disconnectDialog.open();
+    this.$.disconnectDialog.showModal();
   },
 
   /** @private */
   onDisconnectCancel_: function() {
     this.$.disconnectDialog.close();
   },
 
   /** @private */
   onDisconnectConfirm_: function() {
     var deleteProfile = !!this.syncStatus.domain ||
@@ skipping 94 matching lines @@
     if (!syncStatus)
       return '';
     if (syncStatus.hasError)
       return 'settings:sync-problem';
     if (syncStatus.managed)
       return 'settings:sync-disabled';
 
     return 'settings:done';
   },
 });