Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_TreeWalkerWrappingImplementation.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 _TreeWalkerWrappingImplementation extends DOMWrapperBase implements TreeWalker {
-  _TreeWalkerWrappingImplementation() : super() {}
-
-  static create__TreeWalkerWrappingImplementation() native {
-    return new _TreeWalkerWrappingImplementation();
-  }
-
-  Node get currentNode() { return _get_currentNode(this); }
-  static Node _get_currentNode(var _this) native;
-
-  void set currentNode(Node value) { _set_currentNode(this, value); }
-  static void _set_currentNode(var _this, Node value) native;
-
-  bool get expandEntityReferences() { return _get_expandEntityReferences(this); }
-  static bool _get_expandEntityReferences(var _this) native;
-
-  NodeFilter get filter() { return _get_filter(this); }
-  static NodeFilter _get_filter(var _this) native;
-
-  Node get root() { return _get_root(this); }
-  static Node _get_root(var _this) native;
-
-  int get whatToShow() { return _get_whatToShow(this); }
-  static int _get_whatToShow(var _this) native;
-
-  Node firstChild() {
-    return _firstChild(this);
-  }
-  static Node _firstChild(receiver) native;
-
-  Node lastChild() {
-    return _lastChild(this);
-  }
-  static Node _lastChild(receiver) native;
-
-  Node nextNode() {
-    return _nextNode(this);
-  }
-  static Node _nextNode(receiver) native;
-
-  Node nextSibling() {
-    return _nextSibling(this);
-  }
-  static Node _nextSibling(receiver) native;
-
-  Node parentNode() {
-    return _parentNode(this);
-  }
-  static Node _parentNode(receiver) native;
-
-  Node previousNode() {
-    return _previousNode(this);
-  }
-  static Node _previousNode(receiver) native;
-
-  Node previousSibling() {
-    return _previousSibling(this);
-  }
-  static Node _previousSibling(receiver) native;
-
-  String get typeName() { return "TreeWalker"; }
-}