Set limit on maximum width of ChromeVox 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');
 
@@ skipping 13 matching lines @@
   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;
+
+  // Tooltip in case the menu item is cut off.
+  title.title = menuItemTitle;
   this.element.appendChild(title);
 
   var shortcut = document.createElement('td');
   shortcut.className = 'menu-item-shortcut';
   shortcut.textContent = menuItemShortcut;
   this.element.appendChild(shortcut);
 
   if (localStorage['brailleCaptions'] === String(true)) {
     var braille = document.createElement('td');
     braille.className = 'menu-item-shortcut';
     braille.textContent = menuItemBraille;
     this.element.appendChild(braille);
   }
 };
 
 PanelMenuItem.prototype = {
   get text() {
     return this.element.textContent;
   }
 };