FScreenReaderApplicationMessageHandlerBase ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FGenericApplicationMessageHandler](API\Runtime\ApplicationCore\GenericPlatform\FGenericApplicationMessageHandle-) > & InTargetMessageHandler, [FScreenReaderBase](API\Plugins\ScreenReader\GenericPlatform\FScreenReaderBase) & InOwningScreenReader )