TaskManager: minor UI cleanup (consume Esc with context menu opened, use classList).

chrome/browser/resources/task_manager/main.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.
 
 /** @constructor */
 function TaskManager() { }
 
 cr.addSingletonGetter(TaskManager);
 
 /*
@@ skipping 414 matching lines @@
    */
   onTableContextMenuOpened_: function (e) {
     var command = this.table_menu_commands_['tableContextMenu-inspect'];
     var menuItem = command.menuitem;
 
     // Disabled by default.
     menuItem.disabled = true;
     this.currentContextMenuTarget_ = undefined;
 
     var target = e.target;
-    var classes = target.className.split(" ");
-    while (target && classes.indexOf('detail-title') == -1) {
+    var classes = target.classList;
+    while (target &&
+        Array.prototype.indexOf.call(classes, 'detail-title') == -1) {
       target = target.parentNode;
-      classes = target.className.split(" ");
+      classes = target.classList;
     }
 
     if (!target)
       return;
 
     var index_in_group = target.index_in_group;
 
     var canInspect = target.data['canInspect'][index_in_group];
     if (canInspect) {
       menuItem.disabled = false;
@@ skipping 68 matching lines @@
   taskmanager.onTaskChange(start, length, tasks);
 }
 
 function taskRemoved(start, length) {
   // Sometimes this can get called too early.
   if (!taskmanager)
     return;
   taskmanager.onTaskRemove(start, length);
 }