Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_HTMLHRElementWrappingImplementation.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 _HTMLHRElementWrappingImplementation extends _HTMLElementWrappingImplementation implements HTMLHRElement {
-  _HTMLHRElementWrappingImplementation() : super() {}
-
-  static create__HTMLHRElementWrappingImplementation() native {
-    return new _HTMLHRElementWrappingImplementation();
-  }
-
-  String get align() { return _get_align(this); }
-  static String _get_align(var _this) native;
-
-  void set align(String value) { _set_align(this, value); }
-  static void _set_align(var _this, String value) native;
-
-  bool get noShade() { return _get_noShade(this); }
-  static bool _get_noShade(var _this) native;
-
-  void set noShade(bool value) { _set_noShade(this, value); }
-  static void _set_noShade(var _this, bool value) native;
-
-  String get size() { return _get_size(this); }
-  static String _get_size(var _this) native;
-
-  void set size(String value) { _set_size(this, value); }
-  static void _set_size(var _this, String value) native;
-
-  String get width() { return _get_width(this); }
-  static String _get_width(var _this) native;
-
-  void set width(String value) { _set_width(this, value); }
-  static void _set_width(var _this, String value) native;
-
-  String get typeName() { return "HTMLHRElement"; }
-}