Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_StorageWrappingImplementation.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 _StorageWrappingImplementation extends DOMWrapperBase implements Storage {
-  _StorageWrappingImplementation() : super() {}
-
-  static create__StorageWrappingImplementation() native {
-    return new _StorageWrappingImplementation();
-  }
-
-  int get length() { return _get_length(this); }
-  static int _get_length(var _this) native;
-
-  void clear() {
-    _clear(this);
-    return;
-  }
-  static void _clear(receiver) native;
-
-  String getItem(String key) {
-    return _getItem(this, key);
-  }
-  static String _getItem(receiver, key) native;
-
-  String key(int index) {
-    return _key(this, index);
-  }
-  static String _key(receiver, index) native;
-
-  void removeItem(String key) {
-    _removeItem(this, key);
-    return;
-  }
-  static void _removeItem(receiver, key) native;
-
-  void setItem(String key, String data) {
-    _setItem(this, key, data);
-    return;
-  }
-  static void _setItem(receiver, key, data) native;
-
-  String get typeName() { return "Storage"; }
-}