Re-duplicate frontend_accessors.dart.

pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart

Index: pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart b/pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart
index 98a30e47396b1bb3ac7aad6c3dc6a47b9d227acb..cbce131220b0b5942da041643f937e2b3b6aa48f 100644
--- a/pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart
@@ -4,10 +4,9 @@
 
 library fasta.fasta_accessors;
 
-export 'package:kernel/frontend/accessors.dart' show wrapInvalid;
+export 'frontend_accessors.dart' show wrapInvalid;
 
-import 'package:kernel/frontend/accessors.dart'
-    show Accessor, buildIsNull, makeLet;
+import 'frontend_accessors.dart' show Accessor, buildIsNull, makeLet;
 
 import 'package:kernel/ast.dart';
 
@@ -15,7 +14,7 @@ import '../errors.dart' show internalError;
 
 import '../builder/scope.dart' show AccessErrorBuilder, ProblemBuilder;
 
-import 'package:kernel/frontend/accessors.dart' as kernel
+import 'frontend_accessors.dart' as kernel
     show
         IndexAccessor,
         NullAwarePropertyAccessor,