Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_MediaStreamTrackWrappingImplementation.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 _MediaStreamTrackWrappingImplementation extends DOMWrapperBase implements MediaStreamTrack {
-  _MediaStreamTrackWrappingImplementation() : super() {}
-
-  static create__MediaStreamTrackWrappingImplementation() native {
-    return new _MediaStreamTrackWrappingImplementation();
-  }
-
-  bool get enabled() { return _get_enabled(this); }
-  static bool _get_enabled(var _this) native;
-
-  void set enabled(bool value) { _set_enabled(this, value); }
-  static void _set_enabled(var _this, bool value) native;
-
-  String get kind() { return _get_kind(this); }
-  static String _get_kind(var _this) native;
-
-  String get label() { return _get_label(this); }
-  static String _get_label(var _this) native;
-
-  String get typeName() { return "MediaStreamTrack"; }
-}