Move plugins_private to manifest_version 2.

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

Index: chrome/test/data/extensions/uitest/plugins/test.js
===================================================================
--- chrome/test/data/extensions/uitest/plugins/test.js	(revision 0)
+++ chrome/test/data/extensions/uitest/plugins/test.js	(revision 0)
@@ -0,0 +1,14 @@
+// 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.
+
+function testPluginWorks() {
+  var plug = document.getElementById("plugin");
+  var success = false;
+  if (plug && plug.testInvokeDefault) {
+    plug.testInvokeDefault(function(str) {
+      success = true;
+    });
+  }
+  window.domAutomationController.send(success);
+}