Start axing NTP4 dead code.

chrome/browser/resources/ntp4/apps_page.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.
 
 cr.define('ntp', function() {
   'use strict';
 
   var APP_LAUNCH = {
     // The histogram buckets (keep in sync with extension_constants.h).
     NTP_APPS_MAXIMIZED: 0,
     NTP_APPS_COLLAPSED: 1,
     NTP_APPS_MENU: 2,
     NTP_MOST_VISITED: 3,
-    NTP_RECENTLY_CLOSED: 4,
     NTP_APP_RE_ENABLE: 16,
     NTP_WEBSTORE_FOOTER: 18,
     NTP_WEBSTORE_PLUS_ICON: 19,
   };
 
   // Histogram buckets for UMA tracking of where a DnD drop came from.
   var DRAG_SOURCE = {
     SAME_APPS_PANE: 0,
     OTHER_APPS_PANE: 1,
     MOST_VISITED_PANE: 2,
@@ skipping 754 matching lines @@
   function launchAppAfterEnable(appId) {
     chrome.send('launchApp', [appId, APP_LAUNCH.NTP_APP_RE_ENABLE]);
   }
 
   return {
     APP_LAUNCH: APP_LAUNCH,
     AppsPage: AppsPage,
     launchAppAfterEnable: launchAppAfterEnable,
   };
 });