Fix test.

tests/lib/mirrors/library_uri_package_test.dart

Index: tests/lib/mirrors/library_uri_package_test.dart
diff --git a/tests/lib/mirrors/library_uri_package_test.dart b/tests/lib/mirrors/library_uri_package_test.dart
index 30fcd967cf4662f7154fb1154e66c1e1a52429dd..6c8effc44855d420ba56d068998d8e5cf85ddab7 100644
--- a/tests/lib/mirrors/library_uri_package_test.dart
+++ b/tests/lib/mirrors/library_uri_package_test.dart
@@ -20,6 +20,7 @@ testLibraryUri(var value, Uri expectedUri) {
 main() {
   var mirrors = currentMirrorSystem();
   test("Test package library uri", () {
-    testLibraryUri(new ArgParser(), Uri.parse('package:args/args.dart'));
+    testLibraryUri(new ArgParser(),
+        Uri.parse('package:args/src/arg_parser.dart'));
   });
 }