test.py: Support for running tests in checked mode on none-dartium with the browser controller

dart/tools/testing/dart/test_options.dart

Index: dart/tools/testing/dart/test_options.dart
diff --git a/dart/tools/testing/dart/test_options.dart b/dart/tools/testing/dart/test_options.dart
index 38d45a73b15578d732729b521168a19be0fb3a64..0d69ba682b1a88d74f3280ea6774a6a5311fd64a 100644
--- a/dart/tools/testing/dart/test_options.dart
+++ b/dart/tools/testing/dart/test_options.dart
@@ -533,15 +533,6 @@ Note: currently only implemented for dart2js.''',
       print("Error: shard index is ${config['shard']} out of "
             "${config['shards']} shards");
     }
-    if (config['runtime'] == 'dartium' &&
-        const ['none', 'dart2dart'].contains(config['compiler']) &&
-        config['checked']) {
-      // TODO(vsm): Set the DART_FLAGS environment appropriately when
-      // invoking Selenium to support checked mode.  It's not clear
-      // the current selenium API supports this.
-      isValid = false;
-      print("Warning: checked mode is not yet supported for dartium tests.");
-    }
     return isValid;
   }