Get rid of a lot of () for getters.

lib/core/options.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.
 
 // Dart core library.
 
 /**
  * The Options object allows accessing the arguments which have been passed to
  * the current isolate.
  */
 interface Options default RuntimeOptions {
   /**
    * A newly constructed Options object contains the arguments exactly as they
    * have been passed to the isolate.
    */
   Options();
 
   /**
    * Returns a list of arguments that have been passed to this isolate. Any
    * modifications to the list will be contained to the options object owning
    * this list.
    *
    * If the execution environment does not support [arguments] an empty list
    * is returned.
    */
-  List<String> get arguments();
+  List<String> get arguments;
 
   /**
    * Returns the path of the executable used to run the script in this
    * isolate.
    *
    * If the execution environment does not support [executable] an empty
    * string is returned.
    */
-  String get executable();
+  String get executable;
 
   /**
    * Returns the path of the script being run in this isolate.
    *
    * If the executable environment does not support [script] an empty
    * string is returned.
    */
-  String get script();
+  String get script;
 }