Undo test_chat changes

Author: cpsievert

tests/pytest/test_chat.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import sys
 from datetime import datetime
 from typing import Union, cast, get_args, get_origin
 
@@ -385,8 +386,6 @@ def test_as_google_message():
         GenerativeModel,
     )
 
-    from shiny.ui._chat_provider_types import as_google_message
-
     generate_content = GenerativeModel.generate_content  # type: ignore
 
     assert generate_content.__annotations__["contents"] == "content_types.ContentsType"