Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_HTMLBaseElementWrappingImplementation.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 _HTMLBaseElementWrappingImplementation extends _HTMLElementWrappingImplementation implements HTMLBaseElement {
-  _HTMLBaseElementWrappingImplementation() : super() {}
-
-  static create__HTMLBaseElementWrappingImplementation() native {
-    return new _HTMLBaseElementWrappingImplementation();
-  }
-
-  String get href() { return _get_href(this); }
-  static String _get_href(var _this) native;
-
-  void set href(String value) { _set_href(this, value); }
-  static void _set_href(var _this, String value) native;
-
-  String get target() { return _get_target(this); }
-  static String _get_target(var _this) native;
-
-  void set target(String value) { _set_target(this, value); }
-  static void _set_target(var _this, String value) native;
-
-  String get typeName() { return "HTMLBaseElement"; }
-}