Make isEmpty a getter.

runtime/bin/list_stream_impl.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.
 
 /**
  * Default implementation of [ListInputStream].
  */
 class _ListInputStream extends _BaseDataInputStream implements ListInputStream {
   _ListInputStream() : _bufferList = new _BufferList();
 
@@ skipping 108 matching lines @@
       if (_clientCloseHandler !== null) _clientCloseHandler();
     }
 
     // Schedule no pending callback if there is a callback set as this
     // output stream does not wait for any transmission. Schedule
     // close callback once when the stream is closed. Only schedule a
     // new callback if the previous one has actually been called.
     if (_closeCallbackCalled) return;
 
     if (!_streamMarkedClosed) {
-      if (!_bufferList.isEmpty() &&
+      if (!_bufferList.isEmpty &&
           _clientDataHandler != null &&
           _scheduledDataCallback == null) {
         _scheduledDataCallback = new Timer(0, issueDataCallback);
       }
 
       if (_clientNoPendingWriteHandler != null &&
           _scheduledNoPendingWriteCallback == null &&
           _scheduledDataCallback == null) {
         _scheduledNoPendingWriteCallback =
           new Timer(0, issueNoPendingWriteCallback);
@@ skipping 10 matching lines @@
   _BufferList _bufferList;
   bool _streamMarkedClosed = false;
   bool _closeCallbackCalled = false;
   Timer _scheduledDataCallback;
   Timer _scheduledNoPendingWriteCallback;
   Timer _scheduledCloseCallback;
   Function _clientDataHandler;
   Function _clientNoPendingWriteHandler;
   Function _clientCloseHandler;
 }