Fix some tests.

tests/compiler/dart2js/simple_inferrer_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
     '../../../sdk/lib/_internal/compiler/implementation/types/types.dart'
     show TypeMask;
 
 import 'compiler_helper.dart';
 import 'parser_helper.dart';
 
 const String TEST = """
 returnNum1(a) {
   if (a) return 1;
@@ skipping 163 matching lines @@
   checkReturnInClass('B', 'returnNum8', typesInferrer.numType);
 
   checkFactoryConstructor(String className) {
     var cls = findElement(compiler, className);
     var element = cls.localLookup(buildSourceString(className));
     Expect.equals(new TypeMask.nonNullExact(cls.rawType),
                   typesInferrer.returnTypeOf[element]);
   }
   checkFactoryConstructor('A');
 }