[kernel] Fix front_end after previous commit

pkg/kernel/lib/binary/limited_ast_to_binary.dart

Index: pkg/kernel/lib/binary/limited_ast_to_binary.dart
diff --git a/pkg/kernel/lib/binary/limited_ast_to_binary.dart b/pkg/kernel/lib/binary/limited_ast_to_binary.dart
index 6446fe5d06ea0a35aaa47c6a6da88ddf9568b803..12e768b2e679698ff0f9f93364d017c2473f68f5 100644
--- a/pkg/kernel/lib/binary/limited_ast_to_binary.dart
+++ b/pkg/kernel/lib/binary/limited_ast_to_binary.dart
@@ -62,6 +62,12 @@ class LimitedBinaryPrinter extends BinaryPrinter {
     if (node is Library && !predicate(node)) return;
     node.accept(this);
   }
+
+  @override
+  void writeProgramIndex(Program program, List<Library> libraries) {
+    var librariesToWrite = libraries.where(predicate).toList();
+    super.writeProgramIndex(program, librariesToWrite);
+  }
 }
 
 /// Extension of [StringIndexer] that also indexes canonical names of