Remove "View Background Pages".

chrome/browser/resources/task_manager/main.js

 // Copyright (c) 2012 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);
 
 TaskManager.prototype = {
@@ skipping 411 matching lines @@
    * @return {cr.ui.ListItem} created new list item element.
    * @private
    * @this
    */
   renderRow_: function(data, table) {
     var pid = data['processId'][0];
     var cm = table.columnModel;
     var listItem = new cr.ui.ListItem({label: ''});
 
     listItem.className = 'table-row';
-    if (this.opt_.isBackgroundMode && data.isBackgroundResource)
-      listItem.className += ' table-background-row';
 
     for (var i = 0; i < cm.size; i++) {
       var cell = document.createElement('div');
       cell.style.width = cm.getWidth(i) + '%';
       cell.className = 'table-row-cell';
       cell.id = 'column-' + pid + '-' + cm.getId(i);
       cell.appendChild(
           cm.getRenderFunction(i).call(null, data, cm.getId(i), table));
 
       listItem.appendChild(cell);
@@ skipping 239 matching lines @@
     this.table_.redraw();
   },
 };
 
 // |taskmanager| has been declared in preload.js.
 taskmanager = TaskManager.getInstance();
 
 function init() {
   var params = parseQueryParams(window.location);
   var opt = {};
-  opt['isBackgroundMode'] = params.background;
   opt['isShowCloseButton'] = params.showclose;
   taskmanager.initialize(document.body, opt);
 }
 
 document.addEventListener('DOMContentLoaded', init);
 document.addEventListener('Close', taskmanager.onClose.bind(taskmanager));