Remove generated directories with 100s of files.

client/html/generated/html/interface/TreeWalker.dart

Index: client/html/generated/html/interface/TreeWalker.dart
diff --git a/client/html/generated/html/interface/TreeWalker.dart b/client/html/generated/html/interface/TreeWalker.dart
deleted file mode 100644
index 703526778eeb40de4b370acfbdf4fe03aa0c55d9..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/TreeWalker.dart
+++ /dev/null
@@ -1,32 +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 TreeWalker {
-
-  Node currentNode;
-
-  final bool expandEntityReferences;
-
-  final NodeFilter filter;
-
-  final Node root;
-
-  final int whatToShow;
-
-  Node firstChild();
-
-  Node lastChild();
-
-  Node nextNode();
-
-  Node nextSibling();
-
-  Node parentNode();
-
-  Node previousNode();
-
-  Node previousSibling();
-}