Remove generated directories with 100s of files.

client/html/generated/html/interface/DataTransferItemList.dart

Index: client/html/generated/html/interface/DataTransferItemList.dart
diff --git a/client/html/generated/html/interface/DataTransferItemList.dart b/client/html/generated/html/interface/DataTransferItemList.dart
deleted file mode 100644
index 990d4fbb20ae5dab051fe2a07aefae93ed37731e..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/DataTransferItemList.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 DataTransferItemList {
-
-  final int length;
-
-  void add(var data_OR_file, [String type]);
-
-  void clear();
-
-  DataTransferItem item(int index);
-}