dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/23432_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.
 
 // Regression test for http://dartbug.com/23432.  Test that the receiver of a
 // NoSuchMethodError is correct on an intercepted method.  The bug (issue 23432)
 // is that the interceptor is captured instead of the receiver.
 
 import 'package:expect/expect.dart';
 
 class N {
-  noSuchMethod(i) { print('x'); return 42; }
+  noSuchMethod(i) {
+    print('x');
+    return 42;
+  }
 }
 
-@NoInline() @AssumeDynamic()
+@NoInline()
+@AssumeDynamic()
 get NEVER => false;
 
 main() {
   var c = 12345;
   if (NEVER) c = new N();
   var e;
   try {
-    c..toString()..add(88);
+    c
+      ..toString()
+      ..add(88);
   } catch (ex) {
     e = ex;
   }
   var s = e.toString();
   Expect.isTrue(s.contains('$c'), 'Text "$s" should contain "$c"');
 }