Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_HTMLFieldSetElementWrappingImplementation.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 _HTMLFieldSetElementWrappingImplementation extends _HTMLElementWrappingImplementation implements HTMLFieldSetElement {
-  _HTMLFieldSetElementWrappingImplementation() : super() {}
-
-  static create__HTMLFieldSetElementWrappingImplementation() native {
-    return new _HTMLFieldSetElementWrappingImplementation();
-  }
-
-  HTMLFormElement get form() { return _get_form(this); }
-  static HTMLFormElement _get_form(var _this) native;
-
-  String get validationMessage() { return _get_validationMessage(this); }
-  static String _get_validationMessage(var _this) native;
-
-  ValidityState get validity() { return _get_validity(this); }
-  static ValidityState _get_validity(var _this) native;
-
-  bool get willValidate() { return _get_willValidate(this); }
-  static bool _get_willValidate(var _this) native;
-
-  bool checkValidity() {
-    return _checkValidity(this);
-  }
-  static bool _checkValidity(receiver) native;
-
-  void setCustomValidity(String error) {
-    _setCustomValidity(this, error);
-    return;
-  }
-  static void _setCustomValidity(receiver, error) native;
-
-  String get typeName() { return "HTMLFieldSetElement"; }
-}