Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_HashChangeEventWrappingImplementation.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 _HashChangeEventWrappingImplementation extends _EventWrappingImplementation implements HashChangeEvent {
-  _HashChangeEventWrappingImplementation() : super() {}
-
-  static create__HashChangeEventWrappingImplementation() native {
-    return new _HashChangeEventWrappingImplementation();
-  }
-
-  String get newURL() { return _get_newURL(this); }
-  static String _get_newURL(var _this) native;
-
-  String get oldURL() { return _get_oldURL(this); }
-  static String _get_oldURL(var _this) native;
-
-  void initHashChangeEvent(String type, bool canBubble, bool cancelable, String oldURL, String newURL) {
-    _initHashChangeEvent(this, type, canBubble, cancelable, oldURL, newURL);
-    return;
-  }
-  static void _initHashChangeEvent(receiver, type, canBubble, cancelable, oldURL, newURL) native;
-
-  String get typeName() { return "HashChangeEvent"; }
-}