Remove generated directories with 100s of files.

client/html/generated/html/interface/TextTrackList.dart

Index: client/html/generated/html/interface/TextTrackList.dart
diff --git a/client/html/generated/html/interface/TextTrackList.dart b/client/html/generated/html/interface/TextTrackList.dart
deleted file mode 100644
index 92c88c0f87d73110ca054491e03cc6ebf089429b..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/TextTrackList.dart
+++ /dev/null
@@ -1,20 +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 TextTrackList {
-
-  final int length;
-
-  EventListener onaddtrack;
-
-  void addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  bool dispatchEvent(Event evt);
-
-  TextTrack item(int index);
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture]);
-}