Only pass an AssetId to isPrimary and declareOutputs.

pkg/code_transformers/test/entry_point_test.dart

Index: pkg/code_transformers/test/entry_point_test.dart
diff --git a/pkg/code_transformers/test/entry_point_test.dart b/pkg/code_transformers/test/entry_point_test.dart
index f26e9c7eedb61492b8544f597b453efee18197e2..20b354a4e7e203903b678d0b2fd4ba199dcbdea7 100644
--- a/pkg/code_transformers/test/entry_point_test.dart
+++ b/pkg/code_transformers/test/entry_point_test.dart
@@ -98,8 +98,6 @@ class Validator extends Transformer {
 
   Validator(this.validation);
 
-  Future<bool> isPrimary(Asset input) => new Future.value(true);
-
   Future apply(Transform transform) {
     return new Future.value(validation(transform));
   }