remove dummy method handler.

linux/argon2_ffi_plugin.cc

@@ -20,17 +20,7 @@ static void argon2_ffi_plugin_handle_method_call(
     FlMethodCall* method_call) {
   g_autoptr(FlMethodResponse) response = nullptr;
 
-  const gchar* method = fl_method_call_get_name(method_call);
+  response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new());
-
-  if (strcmp(method, "getPlatformVersion") == 0) {
-    struct utsname uname_data = {};
-    uname(&uname_data);
-    g_autofree gchar *version = g_strdup_printf("Linux %s", uname_data.version);
-    g_autoptr(FlValue) result = fl_value_new_string(version);
-    response = FL_METHOD_RESPONSE(fl_method_success_response_new(result));
-  } else {
-    response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new());
-  }
 
   fl_method_call_respond(method_call, response, nullptr);
 }