Remove ProcessOptions and make the options named arguments.

tests/standalone/io/regress_7679_test.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.
 
 import "package:expect/expect.dart";
 import 'dart:io';
 
 main() {
   Directory temp = new Directory('').createTempSync();
   File script = new File('${temp.path}/script.dart');
@@ skipping 16 matching lines @@
       d = new Directory('b/c/d');
       d.create(recursive: true).then((_) {
         d.exists().then((result) {
           Expect.isTrue(result);
         });
       });
     });
   });
 }
 """);
-  ProcessOptions options = new ProcessOptions();
-  options.workingDirectory = temp.path;
   String executable = new File(new Options().executable).fullPathSync();
-  Process.run(executable, ['script.dart'], options).then((result) {
-    temp.deleteSync(recursive: true);
-    Expect.equals(0, result.exitCode);
-  });
+  Process.run(executable, ['script.dart'], workingDirectory: temp.path)
+      .then((result) {
+        temp.deleteSync(recursive: true);
+        Expect.equals(0, result.exitCode);
+      });
 }