Revert "Remove Expect from core library."

tests/language/named_parameters_named_count_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 called 'count'.
 
 
 class TestClass {
   TestClass();
 
   method([count]) => count;
 
   static staticMethod([count]) => count;
 }
 
 globalMethod([count]) => count;
 
 
 main() {
   var obj = new TestClass();
 
   Expect.equals(null, obj.method());
   Expect.equals(0, obj.method(0));
   Expect.equals("", obj.method(""));
 
   Expect.equals(null, TestClass.staticMethod());
   Expect.equals(true, TestClass.staticMethod(true));
   Expect.equals(false, TestClass.staticMethod(false));
 
   Expect.equals(null, globalMethod());
   Expect.equals(true, globalMethod(true));
   Expect.equals(false, globalMethod(false));
 }