Remove cupertino pull to refresh from transitions test (#15813)

diff --git a/examples/flutter_gallery/test_driver/transitions_perf_test.dart b/examples/flutter_gallery/test_driver/transitions_perf_test.dart
index 2b50646..0605380 100644
--- a/examples/flutter_gallery/test_driver/transitions_perf_test.dart
+++ b/examples/flutter_gallery/test_driver/transitions_perf_test.dart
@@ -72,7 +72,6 @@
   const Demo('Dialogs'),
   const Demo('Navigation'),
   const Demo('Pickers'),
-  const Demo('Pull to refresh'),
   const Demo('Sliders'),
   const Demo('Switches'),