Format all tests.

tests/isolate/browser/issue_12474_test.dart

 // Copyright (c) 2015, 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.
 
 // Note: the following comment is used by test.dart to additionally compile the
 // other isolate's code.
 // OtherScripts=issue_12474_child.dart
 // OtherScripts=package/issue_12474_lib.dart
 
 import 'dart:isolate';
 
 final SPAWN_PACKAGE_ROOT = Uri.parse(".");
 
 void main([args, port]) {
   var p = new ReceivePort();
-  Isolate.spawnUri(Uri.parse("issue_12474_child.dart"),
-                   [p.sendPort],
-                   {},
-                   packageRoot: SPAWN_PACKAGE_ROOT);
+  Isolate.spawnUri(Uri.parse("issue_12474_child.dart"), [p.sendPort], {},
+      packageRoot: SPAWN_PACKAGE_ROOT);
   p.listen((msg) {
     print("Received message");
     p.close();
   });
 }