Remove generated directories with 100s of files.

client/dom/generated/src/interface/PeerConnection.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 PeerConnection default _PeerConnectionFactoryProvider {
-
-  PeerConnection(String serverConfiguration, SignalingCallback signalingCallback);
-
-  static final int ACTIVE = 2;
-
-  static final int CLOSED = 3;
-
-  static final int NEGOTIATING = 1;
-
-  static final int NEW = 0;
-
-  final MediaStreamList localStreams;
-
-  EventListener onaddstream;
-
-  EventListener onconnecting;
-
-  EventListener onmessage;
-
-  EventListener onopen;
-
-  EventListener onremovestream;
-
-  EventListener onstatechange;
-
-  final int readyState;
-
-  final MediaStreamList remoteStreams;
-
-  void addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  void addStream(MediaStream stream);
-
-  void close();
-
-  bool dispatchEvent(Event event);
-
-  void processSignalingMessage(String message);
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture]);
-
-  void removeStream(MediaStream stream);
-
-  void send(String text);
-}