Format all tests.

tests/language/field3a_negative_test.dart

 // Copyright (c) 2011, 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 test to catch error reporting bugs in class fields declarations.
 
 import "package:expect/expect.dart";
 
 class C {
-  final a;  // illegal field declaration - must be initialized
+  final a; // illegal field declaration - must be initialized
 }
 
 main() {
   var val = new C();
   Expect.equals(val.a, 0);
 }