Add SuccessResponse to ON_CALL

Author: gspencergoog

shell/platform/linux/fl_platform_plugin.cc

@@ -353,16 +353,12 @@ static void method_call_cb(FlMethodChannel* channel,
     response = clipboard_has_strings_async(self, method_call);
   } else if (strcmp(method, kExitApplicationMethod) == 0) {
     response = system_exit_application(self, method_call);
-  } else if (strcmp(method, kInitializationComplete) == 0) {
+  } else if (strcmp(method, kInitializationCompleteMethod) == 0) {
     response = system_intitialization_complete(self, method_call);
   } else if (strcmp(method, kPlaySoundMethod) == 0) {
     response = system_sound_play(self, args);
   } else if (strcmp(method, kSystemNavigatorPopMethod) == 0) {
     response = system_navigator_pop(self);
-  } else if (strcmp(method, kInitializationCompleteMethod) == 0) {
-    // TODO(gspencergoog): Handle this message to enable exit message listening.
-    // https://github.com/flutter/flutter/issues/126033
-    response = FL_METHOD_RESPONSE(fl_method_success_response_new(nullptr));
   } else {
     response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new());
   }

shell/platform/linux/fl_platform_plugin_test.cc

@@ -114,9 +114,10 @@ TEST(FlPlatformPluginTest, ExitApplication) {
   EXPECT_NE(plugin, nullptr);
   g_autoptr(FlJsonMethodCodec) codec = fl_json_method_codec_new();
 
+  g_autoptr(FlValue) null = fl_value_new_null();
   ON_CALL(messenger, fl_binary_messenger_send_response(
                          ::testing::Eq<FlBinaryMessenger*>(messenger),
-                         ::testing::_, ::testing::_, ::testing::_))
+                         ::testing::_, SuccessResponse(null), ::testing::_))
       .WillByDefault(testing::Return(TRUE));
 
   // Indicate that the binding is initialized.