Revert "Remove Expect from core library."

tests/compiler/dart2js/call_site_type_inferer_static_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 functionName,
                     bool disableInlining,
                     check(compiler, element)) {
@@ skipping 89 matching lines @@
   runTest(TEST_SIX, [HType.NUMBER]);
   runTest(TEST_SEVEN);
   runTest(TEST_EIGHT, [HType.INTEGER, HType.UNKNOWN]);
   runTest(TEST_NINE);
   runTest(TEST_TEN);
 }
 
 void main() {
   test();
 }