Remove generated directories with 100s of files.

client/dom/generated/src/interface/XMLHttpRequest.dart

-// Copyright (c) 2012, 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.
-
-interface XMLHttpRequest extends EventTarget default _XMLHttpRequestFactoryProvider {
-
-  XMLHttpRequest();
-
-  static final int DONE = 4;
-
-  static final int HEADERS_RECEIVED = 2;
-
-  static final int LOADING = 3;
-
-  static final int OPENED = 1;
-
-  static final int UNSENT = 0;
-
-  bool asBlob;
-
-  final int readyState;
-
-  final Object response;
-
-  final Blob responseBlob;
-
-  final String responseText;
-
-  String responseType;
-
-  final Document responseXML;
-
-  final int status;
-
-  final String statusText;
-
-  final XMLHttpRequestUpload upload;
-
-  bool withCredentials;
-
-  void abort();
-
-  void addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  bool dispatchEvent(Event evt);
-
-  String getAllResponseHeaders();
-
-  String getResponseHeader(String header);
-
-  void open(String method, String url, [bool async, String user, String password]);
-
-  void overrideMimeType(String override);
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture]);
-
-  void send([var data]);
-
-  void setRequestHeader(String header, String value);
-}