Convert another batch of extension tests to manifest_version 2

chrome/test/data/extensions/api_test/window_open/spanning/background.html

-<script>
-var nextTest = null;
-openFromNormalShouldOpenInNormal();
-
-function openFromNormalShouldOpenInNormal() {
-  nextTest = openFromExtensionHostInIncognitoBrowserShouldOpenInNormalBrowser;
-  chrome.windows.getAll({populate: true}, function(windows) {
-    chrome.test.assertEq(1, windows.length);
-    chrome.test.assertFalse(windows[0].incognito);
-    chrome.test.assertEq(1, windows[0].tabs.length);
-    chrome.test.assertFalse(windows[0].tabs[0].incognito);
-
-    // The rest of the test continues in infobar.html.
-    chrome.experimental.infobars.show({tabId: windows[0].tabs[0].id,
-                                       path: "infobar.html"});
-  });
-}
-
-function openFromExtensionHostInIncognitoBrowserShouldOpenInNormalBrowser() {
-  nextTest = null;
-  chrome.windows.getCurrent(function(normalWin) {
-    chrome.test.assertFalse(normalWin.incognito);
-    // Create an incognito window.
-    chrome.windows.create({ incognito: true }, function(incognitoWin) {
-      // Remove the normal window. We keep running because of the incognito
-      // window.
-      chrome.windows.remove(normalWin.id, function() {
-        chrome.tabs.getAllInWindow(incognitoWin.id, function(tabs) {
-          chrome.test.assertEq(1, tabs.length);
-          // The rest of the test continues in infobar.html.
-          chrome.experimental.infobars.show({tabId: tabs[0].id,
-                                             path: "infobar.html"});
-        });
-      });
-    });
-  });
-}
-
-function verifyCreatedTab(tab) {
-  // The new tab should be a normal tab, and it should be in a normal
-  // window.
-  chrome.test.assertFalse(tab.incognito);
-  chrome.windows.get(tab.windowId, function(win) {
-    chrome.test.assertFalse(win.incognito);
-    if (nextTest) {
-      nextTest();
-    } else {
-      chrome.test.notifyPass();
-    }
-  });
-}
-</script>
+<!--
+ * 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.
+-->
+<script src="background.js"></script>