Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_HTMLFrameSetElementWrappingImplementation.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 _HTMLFrameSetElementWrappingImplementation extends _HTMLElementWrappingImplementation implements HTMLFrameSetElement {
-  _HTMLFrameSetElementWrappingImplementation() : super() {}
-
-  static create__HTMLFrameSetElementWrappingImplementation() native {
-    return new _HTMLFrameSetElementWrappingImplementation();
-  }
-
-  String get cols() { return _get_cols(this); }
-  static String _get_cols(var _this) native;
-
-  void set cols(String value) { _set_cols(this, value); }
-  static void _set_cols(var _this, String value) native;
-
-  String get rows() { return _get_rows(this); }
-  static String _get_rows(var _this) native;
-
-  void set rows(String value) { _set_rows(this, value); }
-  static void _set_rows(var _this, String value) native;
-
-  String get typeName() { return "HTMLFrameSetElement"; }
-}