Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_TextTrackCueListWrappingImplementation.dart

-// Copyright (c) 2011, 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.
-
-class _TextTrackCueListWrappingImplementation extends DOMWrapperBase implements TextTrackCueList {
-  _TextTrackCueListWrappingImplementation() : super() {}
-
-  static create__TextTrackCueListWrappingImplementation() native {
-    return new _TextTrackCueListWrappingImplementation();
-  }
-
-  int get length() { return _get_length(this); }
-  static int _get_length(var _this) native;
-
-  TextTrackCue getCueById(String id) {
-    return _getCueById(this, id);
-  }
-  static TextTrackCue _getCueById(receiver, id) native;
-
-  TextTrackCue item(int index) {
-    return _item(this, index);
-  }
-  static TextTrackCue _item(receiver, index) native;
-
-  String get typeName() { return "TextTrackCueList"; }
-}