Do not ignore -t, -u arguments to iossim

testing/iossim/iossim.mm

Index: testing/iossim/iossim.mm
diff --git a/testing/iossim/iossim.mm b/testing/iossim/iossim.mm
index 09473b732ca1587c3d042dd3ad5730e32bf82b95..82a59ac33ea97dfadead1d1e4b3a933cd4125981 100644
--- a/testing/iossim/iossim.mm
+++ b/testing/iossim/iossim.mm
@@ -359,9 +359,6 @@ int main(int argc, char* const argv[]) {
       case 'h':
         PrintUsage();
         exit(kExitSuccess);
-      case 'u':
-      case 't':
-        // Ignore 'u' and 't', used by old version of iossim.
         break;
       default:
         PrintUsage();