Generate callbacks as typedefs.

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

Index: client/dom/generated/src/wrapping/_FileCallbackWrappingImplementation.dart
diff --git a/client/dom/generated/src/wrapping/_FileCallbackWrappingImplementation.dart b/client/dom/generated/src/wrapping/_FileCallbackWrappingImplementation.dart
deleted file mode 100644
index 12fff580281b8e8b937dd3c9e4dc770a4fd694cd..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/wrapping/_FileCallbackWrappingImplementation.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 _FileCallbackWrappingImplementation extends DOMWrapperBase implements FileCallback {
-  _FileCallbackWrappingImplementation() : super() {}
-
-  static create__FileCallbackWrappingImplementation() native {
-    return new _FileCallbackWrappingImplementation();
-  }
-
-  bool handleEvent(File file) {
-    return _handleEvent(this, file);
-  }
-  static bool _handleEvent(receiver, file) native;
-
-  String get typeName() { return "FileCallback"; }
-}