dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/useful_error_message_1_test.dart

 // Copyright (c) 2015, 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.
 
 // Test that closures have a useful string that identifies the function by name
 // in error messages.
 
 import "package:expect/expect.dart";
 
 @NoInline()
@@ skipping 15 matching lines @@
   if (!isMinified) {
     Expect.equals("Instance of 'CCCC'", instanceString);
   }
 
   checkContains(String message, String tag) {
     if (!message.contains(tag)) {
       if (!isMinified) {
         Expect.fail('"$message" should contain "$tag"');
       }
       // When minified we will accept quoted names up to 3 characters.
-      Expect.isTrue(
-          message.contains(new RegExp("'..?.?'")),
+      Expect.isTrue(message.contains(new RegExp("'..?.?'")),
           '"$message" should contain minified name');
     }
   }
 
   // We use ArgumentError.value since it prints the value using
   // Error.safeToString.
   var e1 = new ArgumentError.value(c);
   var s1 = '$e1';
   Expect.isTrue(s1.contains(instanceString),
       'Error message "$s1" should contain "$instanceString"');
@@ skipping 26 matching lines @@
   checkContains(s5, "main_closure");
   checkContains('$anon', "main_closure");
 
   // Local named closure.
   localFunction() => c;
   var e6 = new ArgumentError.value(localFunction);
   var s6 = '$e6';
   checkContains(s6, "localFunction");
   checkContains('$localFunction', "localFunction");
 }