Move [file_]byte_store.dart into pkg/front_end/test/src/incremental/.

pkg/analyzer_plugin/lib/plugin/plugin.dart

Index: pkg/analyzer_plugin/lib/plugin/plugin.dart
diff --git a/pkg/analyzer_plugin/lib/plugin/plugin.dart b/pkg/analyzer_plugin/lib/plugin/plugin.dart
index 405ea038be3093a0101460ee23d4442960b21ab6..3a1ef26033144c672e7fef88393ca94b1f2fc1a6 100644
--- a/pkg/analyzer_plugin/lib/plugin/plugin.dart
+++ b/pkg/analyzer_plugin/lib/plugin/plugin.dart
@@ -3,10 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/src/dart/analysis/byte_store.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart'
     show AnalysisDriverGeneric, AnalysisDriverScheduler, PerformanceLog;
-import 'package:analyzer/src/dart/analysis/file_byte_store.dart';
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer_plugin/channel/channel.dart';
@@ -16,6 +14,8 @@ import 'package:analyzer_plugin/protocol/protocol_generated.dart';
 import 'package:analyzer_plugin/src/protocol/protocol_internal.dart';
 import 'package:analyzer_plugin/src/utilities/null_string_sink.dart';
 import 'package:analyzer_plugin/utilities/subscriptions/subscription_manager.dart';
+import 'package:front_end/src/incremental/byte_store.dart';
+import 'package:front_end/src/incremental/file_byte_store.dart';
 import 'package:path/src/context.dart';
 import 'package:pub_semver/pub_semver.dart';