Remove generated directories with 100s of files.

client/html/generated/html/interface/CustomEvent.dart

Index: client/html/generated/html/interface/CustomEvent.dart
diff --git a/client/html/generated/html/interface/CustomEvent.dart b/client/html/generated/html/interface/CustomEvent.dart
deleted file mode 100644
index 54b5a96adbbee5f45f4894b0a7b9e5bc395e5d52..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/CustomEvent.dart
+++ /dev/null
@@ -1,12 +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 CustomEvent extends Event {
-
-  final Object detail;
-
-  void initCustomEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object detailArg);
-}