Remove NPAPI from browser and utility

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

-// Copyright (c) 2012 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 callTestInvokeDefault(plugin) {
-  if (plugin.testInvokeDefault) {
-    plugin.testInvokeDefault(function(str) {
-      window.domAutomationController.send(true);
-    });
-    return;
-  }
-
-  // Try again in 100 ms.
-  window.setTimeout(callTestInvokeDefault.bind(null, plugin), 100);
-}
-
-function testPluginWorks() {
-  if (!navigator.mimeTypes['application/x-extension-test']) {
-    window.domAutomationController.send(false);
-    return;
-  }
-
-  var plug = document.getElementById("plugin");
-  if (!plug) {
-    window.domAutomationController.send(false);
-    return;
-  }
-  callTestInvokeDefault(plug);
-}