Remove generated directories with 100s of files.

client/dom/generated/src/interface/FileReader.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 FileReader default _FileReaderFactoryProvider {
-
-  FileReader();
-
-  static final int DONE = 2;
-
-  static final int EMPTY = 0;
-
-  static final int LOADING = 1;
-
-  final FileError error;
-
-  EventListener onabort;
-
-  EventListener onerror;
-
-  EventListener onload;
-
-  EventListener onloadend;
-
-  EventListener onloadstart;
-
-  EventListener onprogress;
-
-  final int readyState;
-
-  final Object result;
-
-  void abort();
-
-  void addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  bool dispatchEvent(Event evt);
-
-  void readAsArrayBuffer(Blob blob);
-
-  void readAsBinaryString(Blob blob);
-
-  void readAsDataURL(Blob blob);
-
-  void readAsText(Blob blob, [String encoding]);
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture]);
-}