Verify that import prefixes don't shadow exports.

tests/language/export_not_shadowed_by_prefix_helper.dart

Index: tests/language/export_not_shadowed_by_prefix_helper.dart
diff --git a/pkg/analyzer_cli/test/data/linter_project/test_file.dart b/tests/language/export_not_shadowed_by_prefix_helper.dart
similarity index 51%
copy from pkg/analyzer_cli/test/data/linter_project/test_file.dart
copy to tests/language/export_not_shadowed_by_prefix_helper.dart
index c1726a864172154174f7f1d5e9e2812c6663ab5e..3dcd016c6b4b3b7fb5c1f29548aded677d463c3f 100644
--- a/pkg/analyzer_cli/test/data/linter_project/test_file.dart
+++ b/tests/language/export_not_shadowed_by_prefix_helper.dart
@@ -1,7 +1,6 @@
-// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, 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.
 
-library analyzer_cli.test.data.linter_project.test_file;
-
-class a {}
+export "export_not_shadowed_by_prefix_helper2.dart";
+import "dart:core" as f;