Generate callbacks as typedefs.

client/dom/generated/src/wrapping/_ErrorCallbackWrappingImplementation.dart

Index: client/dom/generated/src/wrapping/_ErrorCallbackWrappingImplementation.dart
diff --git a/client/dom/generated/src/wrapping/_ErrorCallbackWrappingImplementation.dart b/client/dom/generated/src/wrapping/_ErrorCallbackWrappingImplementation.dart
deleted file mode 100644
index bbbd544f1692b356e3b87067e2328a49ac11268c..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/wrapping/_ErrorCallbackWrappingImplementation.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-// 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 _ErrorCallbackWrappingImplementation extends DOMWrapperBase implements ErrorCallback {
-  _ErrorCallbackWrappingImplementation() : super() {}
-
-  static create__ErrorCallbackWrappingImplementation() native {
-    return new _ErrorCallbackWrappingImplementation();
-  }
-
-  bool handleEvent(FileError error) {
-    return _handleEvent(this, error);
-  }
-  static bool _handleEvent(receiver, error) native;
-
-  String get typeName() { return "ErrorCallback"; }
-}