message: Fix keep alive stale condition.
diff: @@ -167,7 +167,7 @@ class EagerServiceImpl {
  bool IsStale() {
  mutex_lock l(last_accessed_mu_);
  - return (destroy_after_micros_ <= 0 ||
  + return (destroy_after_micros_ > 0 &&
  (env_->env->NowMicros() - last_accessed_micros_) >
  destroy_after_micros_);
  }
  