Revert of Implement ChromeVox Next menus.

chrome/browser/resources/chromeos/chromevox/cvox2/background/panel_menu_item.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.
-
-/**
- * @fileoverview An item in a drop-down menu in the ChromeVox panel.
- */
-
-goog.provide('PanelMenuItem');
-
-/**
- * @param {string} menuItemTitle The title of the menu item.
- * @param {string} menuItemShortcut The keystrokes to select this item.
- * @param {Function} callback The function to call if this item is selected.
- * @constructor
- */
-PanelMenuItem = function(menuItemTitle, menuItemShortcut, callback) {
-  this.callback = callback;
-
-  this.element = document.createElement('tr');
-  this.element.className = 'menu-item';
-  this.element.tabIndex = -1;
-  this.element.setAttribute('role', 'menuitem');
-
-  this.element.addEventListener('mouseover', (function(evt) {
-    this.element.focus();
-  }).bind(this), false);
-
-  var title = document.createElement('td');
-  title.className = 'menu-item-title';
-  title.textContent = menuItemTitle;
-  this.element.appendChild(title);
-
-  var shortcut = document.createElement('td');
-  shortcut.className = 'menu-item-shortcut';
-  shortcut.textContent = menuItemShortcut;
-  this.element.appendChild(shortcut);
-};