Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_SpeechInputEventWrappingImplementation.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 _SpeechInputEventWrappingImplementation extends _EventWrappingImplementation implements SpeechInputEvent {
-  _SpeechInputEventWrappingImplementation() : super() {}
-
-  static create__SpeechInputEventWrappingImplementation() native {
-    return new _SpeechInputEventWrappingImplementation();
-  }
-
-  SpeechInputResultList get results() { return _get_results(this); }
-  static SpeechInputResultList _get_results(var _this) native;
-
-  String get typeName() { return "SpeechInputEvent"; }
-}