Replace typed_mock with mockito in front_end.

pkg/front_end/test/src/incremental/byte_store_test.dart

Index: pkg/front_end/test/src/incremental/byte_store_test.dart
diff --git a/pkg/front_end/test/src/incremental/byte_store_test.dart b/pkg/front_end/test/src/incremental/byte_store_test.dart
index 6c5083ed45f4c567ec0521fe5049374a29868846..729667935f1e1bcdf0228e75d594141ef54c3585 100644
--- a/pkg/front_end/test/src/incremental/byte_store_test.dart
+++ b/pkg/front_end/test/src/incremental/byte_store_test.dart
@@ -3,9 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:front_end/src/incremental/byte_store.dart';
+import 'package:mockito/mockito.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:typed_mock/typed_mock.dart';
 
 main() {
   defineReflectiveSuite(() {
@@ -118,4 +118,4 @@ class NullByteStoreTest {
   }
 }
 
-class _TestByteStore extends TypedMock implements ByteStore {}
+class _TestByteStore extends Mock implements ByteStore {}