Fix an analyzer warning in barback.

pkg/barback/test/transformer/catch_asset_not_found.dart

Index: pkg/barback/test/transformer/catch_asset_not_found.dart
diff --git a/pkg/barback/test/transformer/catch_asset_not_found.dart b/pkg/barback/test/transformer/catch_asset_not_found.dart
index 51d7e00b2319caba85bc40b9d0ea5c4a8bc1b8d3..2e4e24b5912a1fd4070d44c201ab7e7d04d962dd 100644
--- a/pkg/barback/test/transformer/catch_asset_not_found.dart
+++ b/pkg/barback/test/transformer/catch_asset_not_found.dart
@@ -2,7 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library barback.test.transformer.bad;
+library barback.test.transformer.catch_asset_not_found;
 
 import 'dart:async';