Move plugins_private to manifest_version 2.

chrome/test/data/extensions/uitest/plugins/test.html

Index: chrome/test/data/extensions/uitest/plugins/test.html
===================================================================
--- chrome/test/data/extensions/uitest/plugins/test.html	(revision 113424)
+++ chrome/test/data/extensions/uitest/plugins/test.html	(working copy)
@@ -1,3 +1,8 @@
+<!--
+ * 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.
+-->
 <embed id="plugin"
        type="application/x-extension-test"
        style="width:100; height:100">
@@ -2,13 +7,2 @@
 </embed>
-<script>
-  function testPluginWorks() {
-    var plug = document.getElementById("plugin");
-    var success = false;
-    if (plug && plug.testInvokeDefault) {
-      plug.testInvokeDefault(function(str) {
-        success = true;
-      });
-    }
-    window.domAutomationController.send(success);
-  }
-</script>
+<script src="test.js"></script>