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

chrome/browser/resources/settings/bluetooth_page/bluetooth_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-bluetooth-page' is the settings page for managing bluetooth
  *  properties and devices.
  *
  * Example:
@@ skipping 513 matching lines @@
     if (this.dialogId) {
       // Dialog already opened, just update the contents.
       this.dialogId = dialogId;
       return;
     }
     this.dialogId = dialogId;
     // Call flush so that the dialog gets sized correctly before it is opened.
     Polymer.dom.flush();
     var dialog = this.$$('#deviceDialog');
     dialog.open();
-    dialog.focus();
+    this.startDiscovery_();
   },
 
   /** @private */
   onDialogClosed_: function() {
     this.stopDiscovery_();
     this.dialogId = '';
     this.pairingDevice = null;
     this.pairingEvent = null;
   },
-
-  /** @private */
-  onDialogOpened_: function() { this.startDiscovery_(); },
 });