message: Fix dangling reference bug.
diff: @@ -65,9 +65,9 @@ struct SmartReplyConfig {
  float backoff_confidence;
  // Backoff responses are used when predicted responses cannot fulfill the
  // list.
  - const std::vector<std::string>& backoff_responses;
  + std::vector<std::string> backoff_responses;
  - SmartReplyConfig(std::vector<std::string> backoff_responses)
  + SmartReplyConfig(const std::vector<std::string>& backoff_responses)
  : num_response(kDefaultNumResponse),
  backoff_confidence(kDefaultBackoffConfidence),
  backoff_responses(backoff_responses) {}
  