Chase imports in analyzer's front_end_inference_test.

pkg/front_end/testcases/inference/infer_consts_transitively_2.dart

 // Copyright (c) 2017, 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.
 
 /*@testedFeatures=inference*/
 library test;
 
 import 'infer_consts_transitively_2_a.dart';
 
-const /*@topType=dynamic*/ m1 = a1;
-const /*@topType=dynamic*/ m2 = a2;
+const /*@topType=int*/ m1 = a1;
+const /*@topType=int*/ m2 = a2;
 
 foo() {
   int i;
   i = m1;
 }
+
+main() {}