Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_TextTrackListWrappingImplementation.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 _TextTrackListWrappingImplementation extends DOMWrapperBase implements TextTrackList {
-  _TextTrackListWrappingImplementation() : super() {}
-
-  static create__TextTrackListWrappingImplementation() native {
-    return new _TextTrackListWrappingImplementation();
-  }
-
-  int get length() { return _get_length(this); }
-  static int _get_length(var _this) native;
-
-  EventListener get onaddtrack() { return _get_onaddtrack(this); }
-  static EventListener _get_onaddtrack(var _this) native;
-
-  void set onaddtrack(EventListener value) { _set_onaddtrack(this, value); }
-  static void _set_onaddtrack(var _this, EventListener value) native;
-
-  void addEventListener(String type, EventListener listener, [bool useCapture = null]) {
-    if (useCapture === null) {
-      _addEventListener(this, type, listener);
-      return;
-    } else {
-      _addEventListener_2(this, type, listener, useCapture);
-      return;
-    }
-  }
-  static void _addEventListener(receiver, type, listener) native;
-  static void _addEventListener_2(receiver, type, listener, useCapture) native;
-
-  bool dispatchEvent(Event evt) {
-    return _dispatchEvent(this, evt);
-  }
-  static bool _dispatchEvent(receiver, evt) native;
-
-  TextTrack item(int index) {
-    return _item(this, index);
-  }
-  static TextTrack _item(receiver, index) native;
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture = null]) {
-    if (useCapture === null) {
-      _removeEventListener(this, type, listener);
-      return;
-    } else {
-      _removeEventListener_2(this, type, listener, useCapture);
-      return;
-    }
-  }
-  static void _removeEventListener(receiver, type, listener) native;
-  static void _removeEventListener_2(receiver, type, listener, useCapture) native;
-
-  String get typeName() { return "TextTrackList"; }
-}