Format all tests.

tests/language/vm/regress_28325_test.dart

 // Copyright (c) 2017, 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.
 
 // Test source positions in async errors.
 
 import "package:expect/expect.dart";
 import "dart:io";
 
 main() async {
   try {
     await Socket.connect("localhost", 0);
-    Expect.isTrue(false);  // Unreachable.
+    Expect.isTrue(false); // Unreachable.
   } catch (e, s) {
     Expect.isTrue(e is SocketException);
     Expect.isTrue(s.toString().contains("regress_28325_test.dart"));
     print(s);
-    Expect.isTrue(s.toString().contains(":12"));  // Line number of "await".
+    Expect.isTrue(s.toString().contains(":12")); // Line number of "await".
   }
 }