Move another bunch of extension API tests to manifest_version 2.

chrome/test/data/extensions/api_test/content_scripts/extension_iframe/iframe.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.
+
+// Simple success test: we want content-script APIs to be available (like
+// sendRequest), but other APIs to be undefined.
+var success = false;
+
+try {
+  var foo = chrome.tabs.create;
+} catch (e) {
+  success = e.message.indexOf(
+      " can only be used in extension processes.") > -1;
+}
+
+chrome.extension.sendRequest({success: success});