Remove generated directories with 100s of files.

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

Index: client/dom/generated/src/interface/NotificationCenter.dart
diff --git a/client/dom/generated/src/interface/NotificationCenter.dart b/client/dom/generated/src/interface/NotificationCenter.dart
deleted file mode 100644
index 7823937fc15ce6e12cfc08a37ec00d0579d6feb0..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/interface/NotificationCenter.dart
+++ /dev/null
@@ -1,16 +0,0 @@
-// 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 NotificationCenter {
-
-  int checkPermission();
-
-  Notification createHTMLNotification(String url);
-
-  Notification createNotification(String iconUrl, String title, String body);
-
-  void requestPermission(VoidCallback callback);
-}