Remove generated directories with 100s of files.

client/html/generated/html/frog/StorageEvent.dart

Index: client/html/generated/html/frog/StorageEvent.dart
diff --git a/client/html/generated/html/frog/StorageEvent.dart b/client/html/generated/html/frog/StorageEvent.dart
deleted file mode 100644
index 4b6ab0d8f5fadab2c6fadfd462e47e69c29df68d..0000000000000000000000000000000000000000
--- a/client/html/generated/html/frog/StorageEvent.dart
+++ /dev/null
@@ -1,15 +0,0 @@
-
-class _StorageEventImpl extends _EventImpl implements StorageEvent native "*StorageEvent" {
-
-  final String key;
-
-  final String newValue;
-
-  final String oldValue;
-
-  final _StorageImpl storageArea;
-
-  final String url;
-
-  void initStorageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, String keyArg, String oldValueArg, String newValueArg, String urlArg, _StorageImpl storageAreaArg) native;
-}