Format all tests.

tests/language_strong/extends_test.dart

 // Copyright (c) 2013, 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.
 
 library ExtendsTestMain;
+
 import "extends_test_lib.dart";
 import "package:expect/expect.dart";
 
 // S should extend class A from below, not the one imported
 // from the library.
-class S extends A {
-}
+class S extends A {}
 
 class A {
   var y = "class A from main script";
 }
 
 main() {
   var s = new S();
   Expect.equals("class A from main script", s.y);
 }
-