Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_ValidityStateWrappingImplementation.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 _ValidityStateWrappingImplementation extends DOMWrapperBase implements ValidityState {
-  _ValidityStateWrappingImplementation() : super() {}
-
-  static create__ValidityStateWrappingImplementation() native {
-    return new _ValidityStateWrappingImplementation();
-  }
-
-  bool get customError() { return _get_customError(this); }
-  static bool _get_customError(var _this) native;
-
-  bool get patternMismatch() { return _get_patternMismatch(this); }
-  static bool _get_patternMismatch(var _this) native;
-
-  bool get rangeOverflow() { return _get_rangeOverflow(this); }
-  static bool _get_rangeOverflow(var _this) native;
-
-  bool get rangeUnderflow() { return _get_rangeUnderflow(this); }
-  static bool _get_rangeUnderflow(var _this) native;
-
-  bool get stepMismatch() { return _get_stepMismatch(this); }
-  static bool _get_stepMismatch(var _this) native;
-
-  bool get tooLong() { return _get_tooLong(this); }
-  static bool _get_tooLong(var _this) native;
-
-  bool get typeMismatch() { return _get_typeMismatch(this); }
-  static bool _get_typeMismatch(var _this) native;
-
-  bool get valid() { return _get_valid(this); }
-  static bool _get_valid(var _this) native;
-
-  bool get valueMissing() { return _get_valueMissing(this); }
-  static bool _get_valueMissing(var _this) native;
-
-  String get typeName() { return "ValidityState"; }
-}