Remove generated directories with 100s of files.

client/html/generated/html/interface/BodyElement.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 BodyElement extends Element {
-
-  BodyElementEvents get on();
-
-  String aLink;
-
-  String background;
-
-  String bgColor;
-
-  String link;
-
-  String vLink;
-}
-
-interface BodyElementEvents extends ElementEvents {
-
-  EventListenerList get beforeUnload();
-
-  EventListenerList get blur();
-
-  EventListenerList get error();
-
-  EventListenerList get focus();
-
-  EventListenerList get hashChange();
-
-  EventListenerList get load();
-
-  EventListenerList get message();
-
-  EventListenerList get offline();
-
-  EventListenerList get online();
-
-  EventListenerList get popState();
-
-  EventListenerList get resize();
-
-  EventListenerList get storage();
-
-  EventListenerList get unload();
-}