Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_CSSStyleRuleWrappingImplementation.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 _CSSStyleRuleWrappingImplementation extends _CSSRuleWrappingImplementation implements CSSStyleRule {
-  _CSSStyleRuleWrappingImplementation() : super() {}
-
-  static create__CSSStyleRuleWrappingImplementation() native {
-    return new _CSSStyleRuleWrappingImplementation();
-  }
-
-  String get selectorText() { return _get_selectorText(this); }
-  static String _get_selectorText(var _this) native;
-
-  void set selectorText(String value) { _set_selectorText(this, value); }
-  static void _set_selectorText(var _this, String value) native;
-
-  CSSStyleDeclaration get style() { return _get_style(this); }
-  static CSSStyleDeclaration _get_style(var _this) native;
-
-  String get typeName() { return "CSSStyleRule"; }
-}