Remove generated directories with 100s of files.

client/html/generated/html/dartium/MessageEvent.dart

Index: client/html/generated/html/dartium/MessageEvent.dart
diff --git a/client/html/generated/html/dartium/MessageEvent.dart b/client/html/generated/html/dartium/MessageEvent.dart
deleted file mode 100644
index d8b01c8260adfced707890ff656ed31ac03e9f00..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/MessageEvent.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-
-class _MessageEventImpl extends _EventImpl implements MessageEvent {
-  _MessageEventImpl._wrap(ptr) : super._wrap(ptr);
-
-  Object get data() => _wrap(_ptr.data);
-
-  String get lastEventId() => _wrap(_ptr.lastEventId);
-
-  String get origin() => _wrap(_ptr.origin);
-
-  List get ports() => _wrap(_ptr.ports);
-
-  Window get source() => _wrap(_ptr.source);
-
-  void initMessageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object dataArg, String originArg, String lastEventIdArg, Window sourceArg, List messagePorts) {
-    _ptr.initMessageEvent(_unwrap(typeArg), _unwrap(canBubbleArg), _unwrap(cancelableArg), _unwrap(dataArg), _unwrap(originArg), _unwrap(lastEventIdArg), _unwrap(sourceArg), _unwrap(messagePorts));
-    return;
-  }
-
-  void webkitInitMessageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object dataArg, String originArg, String lastEventIdArg, Window sourceArg, List transferables) {
-    _ptr.webkitInitMessageEvent(_unwrap(typeArg), _unwrap(canBubbleArg), _unwrap(cancelableArg), _unwrap(dataArg), _unwrap(originArg), _unwrap(lastEventIdArg), _unwrap(sourceArg), _unwrap(transferables));
-    return;
-  }
-}