[infra] Remove unneeded check in test.py

All configurations are created with the same named configuration,
if there is a named configuration argument.

Change-Id: I2de34a4a503c34e6b24d3edcf0dd06567ed4f0ed
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/97327
Reviewed-by: Jonas Termansen <sortie@google.com>
diff --git a/tools/testing/dart/options.dart b/tools/testing/dart/options.dart
index cafab24..1111331 100644
--- a/tools/testing/dart/options.dart
+++ b/tools/testing/dart/options.dart
@@ -755,11 +755,6 @@
         }
       }
     }
-
-    if (result.length > 1 && data["named_configuration"] != null) {
-      _fail("Named configuration cannot be used with multiple values for "
-          "arch, compiler, mode, or runtime");
-    }
     return result;
   }