Remove deprecated Expect from the libraries.

tests/language/super_getter_setter_test.dart

 // Copyright (c) 2013, 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";
+
 class A {
   var missingSetterField;
   var missingGetterField;
   var getterInSuperClassField;
   var setterInSuperClassField;
   var getterSetterField;
   var missingAllField;
   var indexField = new List(2);
 
   set setterInSuperClass(a) { setterInSuperClassField = a; }
@@ skipping 79 matching lines @@
     Expect.equals(3, super[0] += 1);
     Expect.equals(3, super[0]);
     Expect.equals(3, super[0]++);
     Expect.equals(4, super[0]);
   }
 }
 
 main() {
   new C().test();
 }