Change test to work with app-snapshots.

tests/language/vm/regress_28325_test.dart

Index: tests/language/vm/regress_28325_test.dart
diff --git a/tests/language/vm/regress_28325_test.dart b/tests/language/vm/regress_28325_test.dart
index 06a922ded4d4f4b0d28953a6ef2e93e37877ee89..5276381996d4a61eefb4ad1633562d6975e350a6 100644
--- a/tests/language/vm/regress_28325_test.dart
+++ b/tests/language/vm/regress_28325_test.dart
@@ -15,6 +15,6 @@ main() async {
     Expect.isTrue(e is SocketException);
     Expect.isTrue(s.toString().contains("regress_28325_test.dart"));
     print(s);
-    Expect.isTrue(s.toString().contains(":12:5"));  // Position of "await".
+    Expect.isTrue(s.toString().contains(":12"));  // Line number of "await".
   }
 }