Format all tests.

tests/isolate/issue_24243_child1_isolate.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.
 
 import 'dart:isolate';
 
 main(List<String> args, message) {
   var sendPort = message;
   try {
     var list0 = <int>[1, 2, 3];
     var list1 = <int>[4, 5, 6];
     var list2 = <int>[7, 8, 9];
     var list = new List<List<int>>.from([list0, list1, list2]);
     sendPort.send(list);
-  } catch(error) {
+  } catch (error) {
     sendPort.send("Invalid Argument(s).");
   }
 }