MD Downloads: convert <paper-dropdown-menu> to <dialog is="cr-action-menu">

chrome/test/data/webui/md_downloads/toolbar_tests.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.
 
 suite('toolbar tests', function() {
   /** @type {!downloads.Toolbar} */
   var toolbar;
 
   setup(function() {
     /**
      * @constructor
      * @extends {downloads.ActionService}
      */
     function TestActionService() {
       downloads.ActionService.call(this);
     }
 
     TestActionService.prototype = {
       __proto__: downloads.ActionService.prototype,
       loadMore: function() { /* Prevent chrome.send(). */ },
     };
 
     toolbar = document.createElement('downloads-toolbar');
     downloads.ActionService.instance_ = new TestActionService;
     document.body.appendChild(toolbar);
   });
 
   test('resize closes more options menu', function() {
-    MockInteractions.tap(toolbar.$$('paper-icon-button'));
-    assertTrue(toolbar.$.more.opened);
+    MockInteractions.tap(toolbar.$.moreActions);
+    assertTrue(toolbar.$.moreActionsMenu.open);
 
     window.dispatchEvent(new CustomEvent('resize'));
-    assertFalse(toolbar.$.more.opened);
+    assertFalse(toolbar.$.moreActionsMenu.open);
   });
 
   test('search starts spinner', function() {
     toolbar.$.toolbar.fire('search-changed', 'a');
     assertTrue(toolbar.spinnerActive);
 
     // Pretend the manager got results and set this to false.
     toolbar.spinnerActive = false;
 
     toolbar.$.toolbar.fire('search-changed', 'a ');  // Same term plus a space.
     assertFalse(toolbar.spinnerActive);
   });
 });