Partial rollback of #10204 (#10256)

This broke Fuchsia as they haven't updated to Dart 1.24 yet :(

packages/flutter_tools/lib/src/doctor.dart

@@ -225,7 +225,7 @@ class _FlutterValidator extends DoctorValidator {
     }
 
     return new ValidationResult(valid, messages,
-      statusInfo: 'on ${os.name}, locale ${platform.localeName}, channel ${version.channel}');
+      statusInfo: 'on ${os.name}, channel ${version.channel}');
   }
 }