Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_DOMParserWrappingImplementation.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 _DOMParserWrappingImplementation extends DOMWrapperBase implements DOMParser {
-  _DOMParserWrappingImplementation() : super() {}
-
-  static create__DOMParserWrappingImplementation() native {
-    return new _DOMParserWrappingImplementation();
-  }
-
-  Document parseFromString(String str, String contentType) {
-    return _parseFromString(this, str, contentType);
-  }
-  static Document _parseFromString(receiver, str, contentType) native;
-
-  String get typeName() { return "DOMParser"; }
-}