MD WebUI: Reimplement cr-shared-menu using iron-dropdown.

chrome/browser/resources/md_history/history_list.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.
 
 Polymer({
   is: 'history-list',
 
   properties: {
     // The search term for the current query. Set when the query returns.
     searchedTerm: {
@@ skipping 37 matching lines @@
   toggleMenu_: function(e) {
     var target = e.detail.target;
     /** @type {CrSharedMenuElement} */(this.$.sharedMenu).toggleMenu(
         target, e.detail.item);
   },
 
   /** @private */
   onMoreFromSiteTap_: function() {
     var menu = /** @type {CrSharedMenuElement} */(this.$.sharedMenu);
     this.fire('search-domain', {domain: menu.itemData.domain});
-    menu.closeMenu();
+    menu.closeMenuNoRefocus();
   },
 
   /** @private */
   onRemoveFromHistoryTap_: function() {
     var menu = /** @type {CrSharedMenuElement} */(this.$.sharedMenu);
     md_history.BrowserService.getInstance()
         .deleteItems([menu.itemData])
         .then(function(items) {
           this.removeDeletedHistory_(items);
           // This unselect-all is to reset the toolbar when deleting a selected
@@ skipping 178 matching lines @@
 
   /**
    * @param {number} index
    * @return {boolean}
    * @private
    */
   isFirstItem_: function(index) {
     return index == 0;
   }
 });