Remove NPObject from generated dart:html for Dartium.

tools/dom/src/native_DOMPublic.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of html;
-
-// testRunner implementation.
-// FIXME: provide a separate lib for testRunner.
-
-var _testRunner;
-
-TestRunner get testRunner {
-  if (_testRunner == null)
-    _testRunner = new TestRunner._(_NPObject.retrieve("testRunner"));
-  return _testRunner;
-}
-
-class TestRunner {
-  final _NPObject _npObject;
-
-  TestRunner._(this._npObject);
-
-  display() => _npObject.invoke('display');
-  dumpAsText() => _npObject.invoke('dumpAsText');
-  notifyDone() => _npObject.invoke('notifyDone');
-  setCanOpenWindows() => _npObject.invoke('setCanOpenWindows');
-  waitUntilDone() => _npObject.invoke('waitUntilDone');
-}