We currently prompt the user to re-enable hosted apps that are disabled for permissions increases when they visit a website corresponding to that app.  This can become very annoying for users, since it isn't immediately obvious why it's happening, and we don't persist any choice.  We could improve the flow a little (e.g. persisting a choice), but really we should just remove it entirely.  Any website that absolutely needs a hosted app enabled can detect for itself that it isn't, and inform the user (with more context than chrome can offer).