Move another block of extension tests to manifest_version 2

chrome/test/data/extensions/api_test/permissions/nacl_enabled/background.html

-<script>
-// OnNaClLoad should be called and invoking a method
-// in a NaCl module should return a correct value.
-
-var pass = chrome.test.callbackPass;
-
-chrome.test.runTests([
-  function nacl() {
-    // Nothing to do here,
-    // we call the callback when we get the notification from NaCl
-  }
-]);
-
-function OnNaClLoad() {
-  try {
-    plugin = document.getElementById('pluginobj');
-    result = plugin.helloworld();
-    if ('hello, world.' != result) {
-      chrome.test.fail();
-    }
-  } catch(e) {
-    chrome.test.fail();
-  }
-  chrome.test.succeed();
-}
-
-function OnNaClFail() {
-  chrome.test.fail();
-}
-</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>
 
 <h1>Native Client SRPC Simple Plug-in</h1>
 <p>
   <embed name="nacl_module"
          id="pluginobj"
          width=0 height=0
          src="bin/x86/srpc_hw.nexe"
          type="application/x-nacl-srpc"
          onload="OnNaClLoad()"
          onfail="OnNaClFail()"
  />
 </p>