Remove generated directories with 100s of files.

client/html/generated/html/interface/DataTransferItem.dart

Index: client/html/generated/html/interface/DataTransferItem.dart
diff --git a/client/html/generated/html/interface/DataTransferItem.dart b/client/html/generated/html/interface/DataTransferItem.dart
deleted file mode 100644
index cb2a9170da38dc1fd0cbe1480d69d04194925827..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/DataTransferItem.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 DataTransferItem {
-
-  final String kind;
-
-  final String type;
-
-  Blob getAsFile();
-
-  void getAsString([StringCallback callback]);
-}