Move another bunch of extension API tests to manifest_version 2.

chrome/test/data/extensions/api_test/content_scripts/dont_match_host_permissions/background.html

-<script>
-var receivedRequests = {};
-
-chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
-  if (receivedRequests[request.source]) {
-    chrome.test.fail(
-        'Received multiple requests from "' + request.source + '".');
-    return;
-  }
-
-  chrome.test.assertEq(request.source == 'a.com', request.modified);
-  receivedRequests[request.source] = true;
-  if (receivedRequests['a.com'] && receivedRequests['b.com'])
-    chrome.test.succeed();
-});
-
-// We load two pages. On a.com, both our modify and test script will run and we
-// will receive a request that says that the page was modified. On b.com, only
-// the test script will run, and the request will say that the page was not
-// modified.
-chrome.test.getConfig(function(config) {
-  chrome.tabs.create({
-      url: 'http://a.com:' + config.testServer.port + 
-           '/files/extensions/test_file.html'});
-  chrome.tabs.create({
-      url: 'http://b.com:' + config.testServer.port + 
-           '/files/extensions/test_file.html'});
-});
-</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>