remove the start dialog for chat's function call

Author: cynthiajoan

firebase_ai_logic_showcase/lib/demos/chat/chat_demo.dart

@@ -44,7 +44,6 @@ class _ChatDemoState extends ConsumerState<ChatDemo> {
   Uint8List? _attachment;
   final ScrollController _scrollController = ScrollController();
   bool _loading = false;
-  static bool _functionCallDialogShown = false;
 
   @override
   void initState() {
@@ -54,43 +53,6 @@ class _ChatDemoState extends ConsumerState<ChatDemo> {
     _chatService.init();
     _userTextInputController.text =
         'Hey Gemini! Can you set the app color to purple?';
-    WidgetsBinding.instance.addPostFrameCallback((_) async {
-      if (!_functionCallDialogShown) {
-        _functionCallDialogShown = true;
-        final trigger = await _showFunctionCallDialog();
-        if (mounted && trigger == true) {
-          sendMessage(_userTextInputController.text);
-        }
-      }
-    });
-  }
-
-  Future<bool?> _showFunctionCallDialog() {
-    return showDialog<bool>(
-      context: context,
-      builder: (BuildContext context) {
-        return AlertDialog(
-          title: const Text('Function Call'),
-          content: const Text(
-            'Do you want to trigger a function call to change app background color?',
-          ),
-          actions: <Widget>[
-            TextButton(
-              child: const Text('No'),
-              onPressed: () {
-                Navigator.of(context).pop(false);
-              },
-            ),
-            TextButton(
-              child: const Text('Yes'),
-              onPressed: () {
-                Navigator.of(context).pop(true);
-              },
-            ),
-          ],
-        );
-      },
-    );
   }
 
   @override