Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_HTMLOptionsCollectionWrappingImplementation.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 _HTMLOptionsCollectionWrappingImplementation extends _HTMLCollectionWrappingImplementation implements HTMLOptionsCollection {
-  _HTMLOptionsCollectionWrappingImplementation() : super() {}
-
-  static create__HTMLOptionsCollectionWrappingImplementation() native {
-    return new _HTMLOptionsCollectionWrappingImplementation();
-  }
-
-  int get length() { return _get_length_HTMLOptionsCollection(this); }
-  static int _get_length_HTMLOptionsCollection(var _this) native;
-
-  void set length(int value) { _set_length_HTMLOptionsCollection(this, value); }
-  static void _set_length_HTMLOptionsCollection(var _this, int value) native;
-
-  int get selectedIndex() { return _get_selectedIndex(this); }
-  static int _get_selectedIndex(var _this) native;
-
-  void set selectedIndex(int value) { _set_selectedIndex(this, value); }
-  static void _set_selectedIndex(var _this, int value) native;
-
-  void remove(int index) {
-    _remove(this, index);
-    return;
-  }
-  static void _remove(receiver, index) native;
-
-  String get typeName() { return "HTMLOptionsCollection"; }
-}