Fix pub build.

sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_from_a_non_dependency_test.dart

Index: sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_from_a_non_dependency_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_from_a_non_dependency_test.dart b/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_from_a_non_dependency_test.dart
index 04b80e285e6e62b236ddb2b15a080bbf5ab2f5b5..2d83d22936396c8155d1f69da001437be0c958ee 100644
--- a/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_from_a_non_dependency_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_from_a_non_dependency_test.dart
@@ -24,7 +24,7 @@ main() {
     // Ignore the line containing the path to the pubspec.
     expect(pub.nextErrLine(), completes);
     expect(pub.nextErrLine(), completion(equals('"transformers.foo" refers to '
-        'a package that\'s not listed in "dependencies".')));
+        'a package that\'s not a dependency.')));
     pub.shouldExit(1);
   });
 }