dart2js: run dartfmt on tests

tests/compiler/dart2js_native/js_const_test.dart

 // Copyright (c) 2014, 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';
 
 import 'dart:_foreign_helper' show JS, JS_CONST;
 
 test1() {
   var re = const JS_CONST(r'/-([\da-z])/ig');
-  var fToUpper = const JS_CONST(
-      r'function(_, letter){return letter.toUpperCase()}');
+  var fToUpper =
+      const JS_CONST(r'function(_, letter){return letter.toUpperCase()}');
   var s1 = '-hello-world';
   var s2 = JS('String', r'#.replace(#, #)', s1, re, fToUpper);
   Expect.equals('HelloWorld', s2);
 
   s1 = 'hello-world';
   s2 = JS('String', r'#.replace(#, #)', s1, re, fToUpper);
   Expect.equals('helloWorld', s2);
 }
 
 main() {
   test1();
 }