Remove generated directories with 100s of files.

client/html/generated/html/interface/MediaError.dart

Index: client/html/generated/html/interface/MediaError.dart
diff --git a/client/html/generated/html/interface/MediaError.dart b/client/html/generated/html/interface/MediaError.dart
deleted file mode 100644
index 0114a09991cc46705936d27ff055397e984e1ce2..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/MediaError.dart
+++ /dev/null
@@ -1,18 +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 MediaError {
-
-  static final int MEDIA_ERR_ABORTED = 1;
-
-  static final int MEDIA_ERR_DECODE = 3;
-
-  static final int MEDIA_ERR_NETWORK = 2;
-
-  static final int MEDIA_ERR_SRC_NOT_SUPPORTED = 4;
-
-  final int code;
-}