Revert "Remove Expect from core library."

tests/lib/scalarlist/float32x4_list_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.
 
 // Library tag to be able to run in html test framework.
 library float32x4_list_test;
 
-import "package:expect/expect.dart";
 import 'dart:scalarlist';
 
 testLoadStore(array) {
   Expect.equals(8, array.length);
   Expect.isTrue(array is List<Float32x4>);
   array[0] = new Float32x4(1.0, 2.0, 3.0, 4.0);
   Expect.equals(1.0, array[0].x);
   Expect.equals(2.0, array[0].y);
   Expect.equals(3.0, array[0].z);
   Expect.equals(4.0, array[0].w);
@@ skipping 39 matching lines @@
     floatList[i] = i.toDouble();
   }
   list = new Float32x4List.view(floatList.asByteArray());
   for (int i = 0; i < 3000; i++) {
     testView(list);
   }
   for (int i = 0; i < 3000; i++) {
     testLoadStore(list);
   }
 }