dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/consistent_subtract_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 '-' and slow path '-' produce the same error.
 
 @NoInline()
 @AssumeDynamic()
@@ skipping 35 matching lines @@
 
   static f3() {
     return (confuse(1) as int) - confuse(null);
   }
 
   static f4() {
     return (confuse(1) as int) - null;
   }
 
   static f5() {
-    var a = confuse(true) ? 1 : 2;  // Small int with unknown value.
+    var a = confuse(true) ? 1 : 2; // Small int with unknown value.
     return a - confuse(null);
   }
 
   static f6() {
-    var a = confuse(true) ? 1 : 2;  // Small int with unknown value.
+    var a = confuse(true) ? 1 : 2; // Small int with unknown value.
     return a - null;
   }
 
   static f7() {
     return 1 - null;
   }
 
   static test() {
     check('IntMinusNull', f1, f2, f3, f4, f5, f6, f7);
   }
 }
 
 class IntMinusString {
   static f1() {
     return confuse(1) - confuse('a');
   }
 
   static f2() {
     return confuse(1) - 'a';
   }
 
   static f3() {
-    var a = confuse(true) ? 1 : 2;  // Small int with unknown value.
+    var a = confuse(true) ? 1 : 2; // Small int with unknown value.
     return a - confuse('a');
   }
 
   static f4() {
     return (confuse(1) as int) - confuse('a');
   }
 
   static f5() {
     return (confuse(1) as int) - 'a';
   }
 
   static f6() {
-    var a = confuse(true) ? 1 : 2;  // Small int with unknown value.
+    var a = confuse(true) ? 1 : 2; // Small int with unknown value.
     return a - 'a';
   }
 
   static f7() {
     return 1 - 'a';
   }
 
   static test() {
     check('IntMinusString', f1, f2, f3, f4, f5, f6, f7);
   }
 }
 
 main() {
   IntMinusNull.test();
   IntMinusString.test();
 }