Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_MediaQueryListWrappingImplementation.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 _MediaQueryListWrappingImplementation extends DOMWrapperBase implements MediaQueryList {
-  _MediaQueryListWrappingImplementation() : super() {}
-
-  static create__MediaQueryListWrappingImplementation() native {
-    return new _MediaQueryListWrappingImplementation();
-  }
-
-  bool get matches() { return _get_matches(this); }
-  static bool _get_matches(var _this) native;
-
-  String get media() { return _get_media(this); }
-  static String _get_media(var _this) native;
-
-  void addListener(MediaQueryListListener listener) {
-    _addListener(this, listener);
-    return;
-  }
-  static void _addListener(receiver, listener) native;
-
-  void removeListener(MediaQueryListListener listener) {
-    _removeListener(this, listener);
-    return;
-  }
-  static void _removeListener(receiver, listener) native;
-
-  String get typeName() { return "MediaQueryList"; }
-}