MD WebUI: Make cr-lazy-render get() synchronous

chrome/browser/resources/md_history/list_container.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.
 
 Polymer({
   is: 'history-list-container',
 
   properties: {
     // The path of the currently selected page.
     selectedPage_: String,
@@ skipping 105 matching lines @@
    * a dialog to confirm that the deletion should be performed.
    */
   deleteSelectedWithPrompt: function() {
     if (!loadTimeData.getBoolean('allowDeletingHistory'))
       return;
 
     var browserService = md_history.BrowserService.getInstance();
     browserService.recordAction('RemoveSelected');
     if (this.queryState.searchTerm != '')
       browserService.recordAction('SearchResultRemove');
-    this.$.dialog.get().then(function(dialog) {
-      dialog.showModal();
-    });
+    this.$.dialog.get().showModal();
   },
 
   /**
    * @param {HistoryRange} range
    * @private
    */
   groupedRangeChanged_: function(range, oldRange) {
     this.selectedPage_ = range == HistoryRange.ALL_TIME ?
       'infinite-list' : 'grouped-list';
 
@@ skipping 56 matching lines @@
   closeMenu_: function() {
     var menu = this.$.sharedMenu.getIfExists();
     if (menu)
       menu.closeMenu();
   },
 
   /**
    * Opens the overflow menu unless the menu is already open and the same button
    * is pressed.
    * @param {{detail: {item: !HistoryEntry, target: !HTMLElement}}} e
-   * @return {Promise<Element>}
    * @private
    */
   toggleMenu_: function(e) {
     var target = e.detail.target;
-    return this.$.sharedMenu.get().then(function(menu) {
-      /** @type {CrSharedMenuElement} */(menu).toggleMenu(
-        target, e.detail);
-    });
+    var menu = /** @type {CrSharedMenuElement} */this.$.sharedMenu.get();
+    menu.toggleMenu(target, e.detail);
   },
 
   /** @private */
   onMoreFromSiteTap_: function() {
     md_history.BrowserService.getInstance().recordAction(
         'EntryMenuShowMoreFromSite');
 
     var menu = assert(this.$.sharedMenu.getIfExists());
     this.fire('search-domain', {domain: menu.itemData.item.domain});
     menu.closeMenu();
@@ skipping 29 matching lines @@
         }.bind(this));
     menu.closeMenu();
   },
 
   /**
    * @return {HTMLElement}
    * @private
    */
   getSelectedList_: function() { return this.$.content.selectedItem; },
 });