Remove deprecated Expect from the libraries.

tests/language/constructor_initializer_test.dart

Index: tests/language/constructor_initializer_test.dart
diff --git a/tests/language/constructor_initializer_test.dart b/tests/language/constructor_initializer_test.dart
index a752ecdc98f9c6f502155cba34dc2955ab7c43ae..fd328b63cce9afe80123c4ca71b4f05b56155b27 100644
--- a/tests/language/constructor_initializer_test.dart
+++ b/tests/language/constructor_initializer_test.dart
@@ -2,6 +2,8 @@
 // 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 _x, _y;
   A(x, [y = 10]): _x = x++, _y = y++ {