Remove generated directories with 100s of files.

client/html/generated/html/frog/_SharedWorkerFactoryProvider.dart

Index: client/html/generated/html/frog/_SharedWorkerFactoryProvider.dart
diff --git a/client/html/generated/html/frog/_SharedWorkerFactoryProvider.dart b/client/html/generated/html/frog/_SharedWorkerFactoryProvider.dart
deleted file mode 100644
index 70271c1d3a68f74560fd259d4bbceee49929ea3f..0000000000000000000000000000000000000000
--- a/client/html/generated/html/frog/_SharedWorkerFactoryProvider.dart
+++ /dev/null
@@ -1,10 +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.
-
-class _SharedWorkerFactoryProvider {
-  factory SharedWorker(String scriptURL, [String name]) native '''
-      if (name == null) return new SharedWorker(scriptURL);
-      return new SharedWorker(scriptURL, name);
-    ''';
-}