remove the export directive from test package

Author: keertip

test/model_test.dart

@@ -286,10 +286,6 @@ void main() {
       expect(Apple.mixins, hasLength(0));
     });
 
-    test('implementors', () {
-      expect(Apple.implementors, hasLength(1));
-    });
-
     test('mixins not private', () {
       expect(F.mixins, hasLength(0));
     });

test_package/lib/fake.dart

@@ -43,7 +43,6 @@ library fake;
 import 'dart:async';
 
 import 'example.dart';
-export 'example.dart' show B;
 
 /// Useful for annotations.
 class Annotation {