Make the repeating argument to timers optional.

runtime/bin/file_impl.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.
 
 class _FileInputStream implements FileInputStream {
   _FileInputStream(File file) {
     _file = file.openSync();
     _length = _file.lengthSync();
     _checkScheduleCallbacks();
   }
@@ skipping 79 matching lines @@
         _closed = true;
       }
     }
 
     // Schedule data callback if there is more data to read. Schedule
     // close callback once when all data has been read. Only schedule
     // a new callback if the previous one has actually been called.
     if (!_closed) {
       if (available() > 0) {
         if (_scheduledDataCallback == null) {
-          _scheduledDataCallback = new Timer(issueDataCallback, 0, false);
+          _scheduledDataCallback = new Timer(issueDataCallback, 0);
         }
       } else if (!_eof) {
         if (_scheduledCloseCallback == null) {
-          _scheduledCloseCallback = new Timer(issueCloseCallback, 0, false);
+          _scheduledCloseCallback = new Timer(issueCloseCallback, 0);
           _eof = true;
         }
       }
     }
   }
 
   RandomAccessFile _file;
   int _length;
   bool _eof = false;
   bool _closed = false;
@@ skipping 1008 matching lines @@
   var _readByteHandler;
   var _readListHandler;
   var _noPendingWriteHandler;
   var _positionHandler;
   var _setPositionHandler;
   var _truncateHandler;
   var _lengthHandler;
   var _flushHandler;
   var _errorHandler;
 }