Move a bunch of extension API tests to manifest_version 2.

chrome/test/data/extensions/api_test/all_urls/execute_script/background.js

+// 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.
+
+chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
+  chrome.tabs.executeScript(tabId, {file: "execute_script.js"});
+});
+
+chrome.extension.onRequest.addListener(
+  function(request, sender, sendResponse) {
+    // Let the extension know where the script ran.
+    var url = sender.tab ? sender.tab.url : 'about:blank';
+    chrome.test.sendMessage('execute: ' + url);
+  });