Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_FileEntrySyncWrappingImplementation.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 _FileEntrySyncWrappingImplementation extends _EntrySyncWrappingImplementation implements FileEntrySync {
-  _FileEntrySyncWrappingImplementation() : super() {}
-
-  static create__FileEntrySyncWrappingImplementation() native {
-    return new _FileEntrySyncWrappingImplementation();
-  }
-
-  FileWriterSync createWriter() {
-    return _createWriter(this);
-  }
-  static FileWriterSync _createWriter(receiver) native;
-
-  File file() {
-    return _file(this);
-  }
-  static File _file(receiver) native;
-
-  String get typeName() { return "FileEntrySync"; }
-}