Moves over remaining .dart code references to 'factory' in interface declartions to 'default'

client/html/generated/src/interface/FileReader.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.
 
-interface FileReader factory FileReaderFactoryProvider {
+interface FileReader default FileReaderFactoryProvider {
 
   FileReader();
 
   static final int DONE = 2;
 
   static final int EMPTY = 0;
 
   static final int LOADING = 1;
 
   FileError get error();
 
   int get readyState();
 
   String get result();
 
   void abort();
 
   void readAsArrayBuffer(Blob blob);
 
   void readAsBinaryString(Blob blob);
 
   void readAsDataURL(Blob blob);
 
   void readAsText(Blob blob, [String encoding]);
 }