Remove generated directories with 100s of files.

client/html/generated/html/interface/TrackElement.dart

Index: client/html/generated/html/interface/TrackElement.dart
diff --git a/client/html/generated/html/interface/TrackElement.dart b/client/html/generated/html/interface/TrackElement.dart
deleted file mode 100644
index 7b65a0b08557a2b77fb97860d21faaae31cbc818..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/TrackElement.dart
+++ /dev/null
@@ -1,30 +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 TrackElement extends Element {
-
-  static final int ERROR = 3;
-
-  static final int LOADED = 2;
-
-  static final int LOADING = 1;
-
-  static final int NONE = 0;
-
-  bool isDefault;
-
-  String kind;
-
-  String label;
-
-  final int readyState;
-
-  String src;
-
-  String srclang;
-
-  final TextTrack track;
-}