Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_XPathNSResolverWrappingImplementation.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 _XPathNSResolverWrappingImplementation extends DOMWrapperBase implements XPathNSResolver {
-  _XPathNSResolverWrappingImplementation() : super() {}
-
-  static create__XPathNSResolverWrappingImplementation() native {
-    return new _XPathNSResolverWrappingImplementation();
-  }
-
-  String lookupNamespaceURI(String prefix) {
-    return _lookupNamespaceURI(this, prefix);
-  }
-  static String _lookupNamespaceURI(receiver, prefix) native;
-
-  String get typeName() { return "XPathNSResolver"; }
-}