dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/closure7_test.dart

 // Copyright (c) 2012, 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 "package:expect/expect.dart";
 
 var foo;
 bar() => foo(3, 99);
 gee(f) => foo(fun: f);
 
@@ skipping 39 matching lines @@
   Expect.equals(499, A.foo2());
   A.foo = (x, y) => x + y;
   Expect.equals(102, A.bar2());
   A.foo = ({fun: null}) => fun(41);
   Expect.equals(42, A.gee2((x) => x + 1));
 }
 
 main() {
   globalTest();
   staticTest();
-}
+}