Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_NodeSelectorWrappingImplementation.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 _NodeSelectorWrappingImplementation extends DOMWrapperBase implements NodeSelector {
-  _NodeSelectorWrappingImplementation() : super() {}
-
-  static create__NodeSelectorWrappingImplementation() native {
-    return new _NodeSelectorWrappingImplementation();
-  }
-
-  Element querySelector(String selectors) {
-    return _querySelector(this, selectors);
-  }
-  static Element _querySelector(receiver, selectors) native;
-
-  NodeList querySelectorAll(String selectors) {
-    return _querySelectorAll(this, selectors);
-  }
-  static NodeList _querySelectorAll(receiver, selectors) native;
-
-  String get typeName() { return "NodeSelector"; }
-}