Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_DocumentTypeWrappingImplementation.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 _DocumentTypeWrappingImplementation extends _NodeWrappingImplementation implements DocumentType {
-  _DocumentTypeWrappingImplementation() : super() {}
-
-  static create__DocumentTypeWrappingImplementation() native {
-    return new _DocumentTypeWrappingImplementation();
-  }
-
-  NamedNodeMap get entities() { return _get_entities(this); }
-  static NamedNodeMap _get_entities(var _this) native;
-
-  String get internalSubset() { return _get_internalSubset(this); }
-  static String _get_internalSubset(var _this) native;
-
-  String get name() { return _get_name(this); }
-  static String _get_name(var _this) native;
-
-  NamedNodeMap get notations() { return _get_notations(this); }
-  static NamedNodeMap _get_notations(var _this) native;
-
-  String get publicId() { return _get_publicId(this); }
-  static String _get_publicId(var _this) native;
-
-  String get systemId() { return _get_systemId(this); }
-  static String _get_systemId(var _this) native;
-
-  String get typeName() { return "DocumentType"; }
-}