Remove generated directories with 100s of files.

client/dom/generated/src/interface/DOMApplicationCache.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 ApplicationCache extends EventTarget {
-
-  final int status;
-
-  void abort();
-
-  void addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  bool dispatchEvent(Event evt);
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture]);
-
-  void swapCache();
-
-  void update();
-}
-
-interface DOMApplicationCache extends ApplicationCache {
-
-  static final int CHECKING = 2;
-
-  static final int DOWNLOADING = 3;
-
-  static final int IDLE = 1;
-
-  static final int OBSOLETE = 5;
-
-  static final int UNCACHED = 0;
-
-  static final int UPDATEREADY = 4;
-}