Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_DOMSettableTokenListWrappingImplementation.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 _DOMSettableTokenListWrappingImplementation extends _DOMTokenListWrappingImplementation implements DOMSettableTokenList {
-  _DOMSettableTokenListWrappingImplementation() : super() {}
-
-  static create__DOMSettableTokenListWrappingImplementation() native {
-    return new _DOMSettableTokenListWrappingImplementation();
-  }
-
-  String get value() { return _get_value(this); }
-  static String _get_value(var _this) native;
-
-  void set value(String value) { _set_value(this, value); }
-  static void _set_value(var _this, String value) native;
-
-  String get typeName() { return "DOMSettableTokenList"; }
-}