Fix some tests.

tests/compiler/dart2js/literal_map_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.
 
+import 'package:expect/expect.dart';
 import "compiler_helper.dart";
 
 const String TEST = """
 foo() {
   var a = {};
   var index = foo(); // Make sure we want to optimize this method.
   while (true) a[index] = 1;
 }
 """;
 
 main() {
   String generated = compile(TEST, entry: 'foo');
   // Make sure we have all the type information we need.
   Expect.isFalse(generated.contains('bailout'));
   Expect.isFalse(generated.contains('interceptor'));
   // Make sure we don't go through an interceptor.
   Expect.isTrue(generated.contains('a.\$indexSet'));
 }