dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/26243_test.dart

 // Copyright (c) 2016, 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 trace = [];
 void write(String s, int a, int b) {
   trace.add("$s $a $b");
 }
@@ skipping 17 matching lines @@
   i = 0;
   try {
     write("baz-try", i, i += 1);
   } catch (_) {}
 }
 
 void main() {
   foo();
   bar();
   baz();
-  Expect.listEquals(['foo 0 1', 'bar 0 1', 'baz-notry 0 1', 'baz-try 0 1'],
-      trace);
+  Expect.listEquals(
+      ['foo 0 1', 'bar 0 1', 'baz-notry 0 1', 'baz-try 0 1'], trace);
 }