Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_WorkerNavigatorWrappingImplementation.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.
-
-// WARNING: Do not edit - generated code.
-
-class _WorkerNavigatorWrappingImplementation extends DOMWrapperBase implements WorkerNavigator {
-  _WorkerNavigatorWrappingImplementation() : super() {}
-
-  static create__WorkerNavigatorWrappingImplementation() native {
-    return new _WorkerNavigatorWrappingImplementation();
-  }
-
-  String get appName() { return _get_appName(this); }
-  static String _get_appName(var _this) native;
-
-  String get appVersion() { return _get_appVersion(this); }
-  static String _get_appVersion(var _this) native;
-
-  bool get onLine() { return _get_onLine(this); }
-  static bool _get_onLine(var _this) native;
-
-  String get platform() { return _get_platform(this); }
-  static String _get_platform(var _this) native;
-
-  String get userAgent() { return _get_userAgent(this); }
-  static String _get_userAgent(var _this) native;
-
-  String get typeName() { return "WorkerNavigator"; }
-}