Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_WorkerWrappingImplementation.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 _WorkerWrappingImplementation extends _AbstractWorkerWrappingImplementation implements Worker {
-  _WorkerWrappingImplementation() : super() {}
-
-  static create__WorkerWrappingImplementation() native {
-    return new _WorkerWrappingImplementation();
-  }
-
-  void postMessage(Dynamic message, [List messagePorts = null]) {
-    if (messagePorts === null) {
-      _postMessage(this, message);
-      return;
-    } else {
-      _postMessage_2(this, message, messagePorts);
-      return;
-    }
-  }
-  static void _postMessage(receiver, message) native;
-  static void _postMessage_2(receiver, message, messagePorts) native;
-
-  void terminate() {
-    _terminate(this);
-    return;
-  }
-  static void _terminate(receiver) native;
-
-  void webkitPostMessage(Dynamic message, [List messagePorts = null]) {
-    if (messagePorts === null) {
-      _webkitPostMessage(this, message);
-      return;
-    } else {
-      _webkitPostMessage_2(this, message, messagePorts);
-      return;
-    }
-  }
-  static void _webkitPostMessage(receiver, message) native;
-  static void _webkitPostMessage_2(receiver, message, messagePorts) native;
-
-  String get typeName() { return "Worker"; }
-}