Remove generated directories with 100s of files.

client/html/generated/html/interface/ShadowRoot.dart

Index: client/html/generated/html/interface/ShadowRoot.dart
diff --git a/client/html/generated/html/interface/ShadowRoot.dart b/client/html/generated/html/interface/ShadowRoot.dart
deleted file mode 100644
index 8fa77cda80512209661e14f862edc37138cf8605..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/ShadowRoot.dart
+++ /dev/null
@@ -1,22 +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.
-
-// WARNING: Do not edit - generated code.
-
-interface ShadowRoot extends DocumentFragment default _ShadowRootFactoryProvider {
-
-  ShadowRoot(Element host);
-
-  final Element host;
-
-  String innerHTML;
-
-  Element getElementById(String elementId);
-
-  NodeList getElementsByClassName(String className);
-
-  NodeList getElementsByTagName(String tagName);
-
-  NodeList getElementsByTagNameNS(String namespaceURI, String localName);
-}