15 std::unique_ptr<fml::Mapping> mapping) {
24 std::lock_guard lock(pending_responses_mutex_);
25 auto it = pending_responses_.find(response_id);
26 if (it == pending_responses_.end()) {
29 message_response = std::move(it->second);
30 pending_responses_.erase(it);
33 message_response->Complete(std::move(mapping));