Revert "Remove Expect from core library."

tests/language/named_parameters_with_object_property_names_test.dart

Index: tests/language/named_parameters_with_object_property_names_test.dart
diff --git a/tests/language/named_parameters_with_object_property_names_test.dart b/tests/language/named_parameters_with_object_property_names_test.dart
index e291bc82d38ac33e17522cbcda72abfe2ebadd7d..2f6c03caa0747c13182a0d0cf90177376e05de21 100644
--- a/tests/language/named_parameters_with_object_property_names_test.dart
+++ b/tests/language/named_parameters_with_object_property_names_test.dart
@@ -2,8 +2,6 @@
 // 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 for named parameter with the name of a JavaScript property found on
 // 'Object'.  For such a NAME, foo.NAME may exist in an empty map, i.e.
 //    'toString' in {} --> true.