[Multi Profile] Double-clicking an item in the user list should edit that profile.

chrome/browser/resources/options/personal_options_profile_list.js

 // Copyright (c) 2011 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.
 
 cr.define('options.personal_options', function() {
   const DeletableItem = options.DeletableItem;
   const DeletableItemList = options.DeletableItemList;
   const ListSingleSelectionModel = cr.ui.ListSingleSelectionModel;
 
   var localStrings = new LocalStrings();
@@ skipping 65 matching lines @@
     /** @inheritDoc */
     createItem: function(pageInfo) {
       var item = new ProfileListItem(pageInfo);
       return item;
     },
 
     /** @inheritDoc */
     deleteItemAtIndex: function(index) {
       ManageProfileOverlay.showDeleteDialog(this.dataModel.item(index));
     },
+
+    /** @inheritDoc */
+    activateItemAtIndex: function(index) {
+      ManageProfileOverlay.showManageDialog(this.dataModel.item(index));
+    },
   };
 
   return {
     ProfileList: ProfileList
   };
 });