MD Settings: Migrate from paper-drawer-panel to app-drawer.

chrome/browser/resources/settings/settings_ui/settings_ui.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-ui' implements the UI for the Settings page.
  *
  * Example:
  *
@@ skipping 15 matching lines @@
       type: Object,
     },
   },
 
   listeners: {
     'sideNav.iron-activate': 'onIronActivate_',
   },
 
   /** @private */
   onIronActivate_: function() {
-    this.$.panel.closeDrawer();
+    this.$$('app-drawer').close();
+  },
+
+  /** @private */
+  onMenuButtonTap_: function() {
+    this.$$('app-drawer').toggle();
   },
 
   /** @private */
   directionDelegateChanged_: function() {
-    this.$.panel.rightDrawer = this.directionDelegate.isRtl();
+    this.$$('app-drawer').align = this.directionDelegate.isRtl() ?
+        'right' : 'left';
   },
 });