Revert "Remove Expect from core library."

tests/standalone/io/status_file_parser_test.dart

 // Copyright (c) 2012, 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 StatusFileParserTest;
 
-import "package:expect/expect.dart";
 import "dart:io";
 import "../../../tools/testing/dart/status_file_parser.dart";
 
 
 void main() {
   TestReadStatusFile("client/tests/dartc/dartc.status");
   TestReadStatusFile("compiler/tests/dartc/dartc.status");
   TestReadStatusFile("frog/tests/frog/frog.status");
   TestReadStatusFile("runtime/tests/vm/vm.status");
   TestReadStatusFile("samples/tests/samples/samples.status");
@@ skipping 18 matching lines @@
 
 void TestReadStatusFile(String filePath) {
   File file = new File(fixedFilePath(filePath));
   if (file.existsSync()) {
     List<Section> sections = new List<Section>();
     ReadConfigurationInto(file.name, sections, () {
       Expect.isTrue(sections.length > 0);
     });
   }
 }