Remove generated directories with 100s of files.

client/html/generated/html/frog/Worker.dart

Index: client/html/generated/html/frog/Worker.dart
diff --git a/client/html/generated/html/frog/Worker.dart b/client/html/generated/html/frog/Worker.dart
deleted file mode 100644
index fd8ceeb63c730a2e97082a8d6b299b5d47793ead..0000000000000000000000000000000000000000
--- a/client/html/generated/html/frog/Worker.dart
+++ /dev/null
@@ -1,18 +0,0 @@
-
-class _WorkerImpl extends _AbstractWorkerImpl implements Worker native "*Worker" {
-
-  _WorkerEventsImpl get on() =>
-    new _WorkerEventsImpl(this);
-
-  void postMessage(Dynamic message, [List messagePorts = null]) native;
-
-  void terminate() native;
-
-  void webkitPostMessage(Dynamic message, [List messagePorts = null]) native;
-}
-
-class _WorkerEventsImpl extends _AbstractWorkerEventsImpl implements WorkerEvents {
-  _WorkerEventsImpl(_ptr) : super(_ptr);
-
-  EventListenerList get message() => _get('message');
-}