Remove generated directories with 100s of files.

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

Index: client/dom/generated/src/interface/HTMLKeygenElement.dart
diff --git a/client/dom/generated/src/interface/HTMLKeygenElement.dart b/client/dom/generated/src/interface/HTMLKeygenElement.dart
deleted file mode 100644
index d55ca5cb49ca8a646b5b8655173fe3dd50441963..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/interface/HTMLKeygenElement.dart
+++ /dev/null
@@ -1,34 +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 HTMLKeygenElement extends HTMLElement {
-
-  bool autofocus;
-
-  String challenge;
-
-  bool disabled;
-
-  final HTMLFormElement form;
-
-  String keytype;
-
-  final NodeList labels;
-
-  String name;
-
-  final String type;
-
-  final String validationMessage;
-
-  final ValidityState validity;
-
-  final bool willValidate;
-
-  bool checkValidity();
-
-  void setCustomValidity(String error);
-}