dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/consistent_null_add_error_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.
 
 import "package:expect/expect.dart";
 
 // Test that optimized 'null + x' and slow path '+' produce the same error.
 //
 // They don't, sometimes we generate null.$add, sometimes JSNull_methods.$add.
 
-
 @NoInline()
 @AssumeDynamic()
 confuse(x) => x;
 
 void check2(String name, name1, f1, name2, f2) {
   Error trap(part, f) {
     try {
       f();
     } catch (e) {
       return e;
     }
     Expect.fail('should throw: $name.$part');
   }
+
   var e1 = trap(name1, f1);
   var e2 = trap(name2, f2);
   var s1 = '$e1';
   var s2 = '$e2';
   Expect.equals(s1, s2, '\n  $name.$name1: "$s1"\n  $name.$name2: "$s2"\n');
 }
 
 void check(String name, f1, f2, [f3, f4, f5, f6]) {
   check2(name, 'f1', f1, 'f2', f2);
   if (f3 != null) check2(name, 'f1', f1, 'f3', f3);
   if (f4 != null) check2(name, 'f1', f1, 'f4', f4);
   if (f5 != null) check2(name, 'f1', f1, 'f5', f5);
   if (f6 != null) check2(name, 'f1', f1, 'f6', f6);
 }
 
-
 class NullPlusInt {
   static f1() {
     return confuse(null) + confuse(1);
   }
 
   static f2() {
     return confuse(null) + 1;
   }
 
   static f3() {
@@ skipping 22 matching lines @@
     check('NullPlusInt', f3, f3);
     check('NullPlusInt', f4, f4);
     check('NullPlusInt', f5, f5);
     check('NullPlusInt', f6, f6);
   }
 }
 
 main() {
   NullPlusInt.test();
 }