Remove generated directories with 100s of files.

client/dom/generated/src/frog/MessageEvent.dart

Index: client/dom/generated/src/frog/MessageEvent.dart
diff --git a/client/dom/generated/src/frog/MessageEvent.dart b/client/dom/generated/src/frog/MessageEvent.dart
deleted file mode 100644
index 08af26a830a06a25abacd1b6517d8facd248f626..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/frog/MessageEvent.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-
-class _MessageEventJs extends _EventJs implements MessageEvent native "*MessageEvent" {
-
-  final Object data;
-
-  final String lastEventId;
-
-  final String origin;
-
-  final List ports;
-
-  final _DOMWindowJs source;
-
-  void initMessageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object dataArg, String originArg, String lastEventIdArg, _DOMWindowJs sourceArg, List messagePorts) native;
-
-  void webkitInitMessageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object dataArg, String originArg, String lastEventIdArg, _DOMWindowJs sourceArg, List transferables) native;
-}