Remove generated directories with 100s of files.

client/html/generated/html/interface/Clipboard.dart

Index: client/html/generated/html/interface/Clipboard.dart
diff --git a/client/html/generated/html/interface/Clipboard.dart b/client/html/generated/html/interface/Clipboard.dart
deleted file mode 100644
index 509367d84f74b731f22975f960a2efa3f26f098a..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/Clipboard.dart
+++ /dev/null
@@ -1,26 +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 Clipboard {
-
-  String dropEffect;
-
-  String effectAllowed;
-
-  final FileList files;
-
-  final DataTransferItemList items;
-
-  final List types;
-
-  void clearData([String type]);
-
-  String getData(String type);
-
-  bool setData(String type, String data);
-
-  void setDragImage(ImageElement image, int x, int y);
-}