Revert "Remove Expect from core library."

tests/language/named_parameters_with_object_property_names_test.dart

 // Copyright (c) 2011, 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 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.
 
 
 main() {
   // Test properties found on instances of Object in Chrome 15 and Firefox 6.
   test_constructor();
   test___proto__();
   test___defineGetter__();
@@ skipping 340 matching lines @@
 
   Expect.equals(null, obj.method());
   Expect.equals(0, obj.method(watch: 0));
 
   Expect.equals(null, TestClass_watch.staticMethod());
   Expect.equals(0, TestClass_watch.staticMethod(watch: 0));
 
   Expect.equals(null, globalMethod_watch());
   Expect.equals(0, globalMethod_watch(watch: 0));
 }