Revert "Remove Expect from core library."

tests/compiler/dart2js/call_site_type_inferer_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.
 
-import "package:expect/expect.dart";
 import '../../../sdk/lib/_internal/compiler/implementation/js_backend/js_backend.dart';
 import '../../../sdk/lib/_internal/compiler/implementation/ssa/ssa.dart';
 
 import 'compiler_helper.dart';
 import 'parser_helper.dart';
 
 void compileAndFind(String code,
                     String className,
                     String memberName,
                     bool disableInlining,
@@ skipping 250 matching lines @@
   defaultTypes.update(0, const SourceString("p2"), HType.INTEGER);
   defaultTypes.update(1, const SourceString("p3"), HType.STRING);
   runTest(TEST_17, [HType.INTEGER, HType.BOOLEAN, HType.DOUBLE], defaultTypes);
 
   runTest(TEST_18);
 }
 
 void main() {
   test();
 }