Remove generated directories with 100s of files.

client/dom/generated/src/frog/_MediaControllerFactoryProvider.dart

Index: client/dom/generated/src/frog/_MediaControllerFactoryProvider.dart
diff --git a/client/dom/generated/src/frog/_MediaControllerFactoryProvider.dart b/client/dom/generated/src/frog/_MediaControllerFactoryProvider.dart
deleted file mode 100644
index 371ccb931eca9c65faefabb443501b41b816d546..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/frog/_MediaControllerFactoryProvider.dart
+++ /dev/null
@@ -1,8 +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.
-
-class _MediaControllerFactoryProvider {
-  factory MediaController() native
-      '''return new MediaController();''';
-}