Move byte_store.dart and file_byte_store.dart to their own subdirectory.

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index dc310067394b76b1d728b9877f6a81b7700262fc..25ede0db1b76b4aa48a602352d87b4ddca23430c 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -58,8 +58,8 @@ import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:analyzer/src/util/glob.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart' hide Element;
 import 'package:front_end/src/base/performace_logger.dart';
-import 'package:front_end/src/incremental/byte_store.dart';
-import 'package:front_end/src/incremental/file_byte_store.dart';
+import 'package:front_end/src/byte_store/byte_store.dart';
+import 'package:front_end/src/byte_store/file_byte_store.dart';
 import 'package:plugin/plugin.dart';
 import 'package:telemetry/crash_reporting.dart';
 import 'package:telemetry/telemetry.dart' as telemetry;