Revert of Test Keeping NaCl plugins used in app background pages alive when active.

ppapi/tests/extensions/background_keepalive/background.js

-// Copyright (c) 2013 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.
-
-var NaClModulesExpected = 0;
-var NaClModulesLoaded = 0;
-
-// Indicate load success.
-function moduleDidLoad() {
-  NaClModulesLoaded++;
-  if (NaClModulesLoaded == NaClModulesExpected)
-    chrome.test.sendMessage("nacl_modules_loaded", handleChromeTestMessage);
-}
-
-var handleChromeTestMessage = function (message) {
-  NaClModules = document.querySelectorAll('embed');
-  for (var i = 0; i < NaClModules.length; i++) {
-    NaClModules[i].postMessage(message);
-  }
-}
-
-function handleNaclMessage(message_event) {
-  console.log("handleNaclMessage: " + message_event.data);
-}
-
-function createNaClEmbed() {
-  NaClModulesExpected++;
-
-  var listener = document.createElement("div");
-  listener.addEventListener("load", moduleDidLoad, true);
-  listener.addEventListener("message", handleNaclMessage, true);
-  listener.innerHTML = '<embed' +
-    ' src="ppapi_tests_extensions_background_keepalive.nmf"' +
-    ' type="application/x-nacl" />';
-  document.body.appendChild(listener);
-}
-
-// Create 2 embeds to verify that we can handle more than one.
-createNaClEmbed();
-createNaClEmbed();
-