Automatically generate most constructors

client/dom/generated/src/interface/FileReaderSync.dart

 // Copyright (c) 2012, 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.
 
-interface FileReaderSync {
+interface FileReaderSync default _FileReaderSyncFactoryProvider {
+
+  FileReaderSync();
 
   ArrayBuffer readAsArrayBuffer(Blob blob);
 
   String readAsBinaryString(Blob blob);
 
   String readAsDataURL(Blob blob);
 
   String readAsText(Blob blob, [String encoding]);
 }