It's going to be removed from Chromium, see https://crbug.com/812523.

/cc @electron/code-owners 
chromium_src/chrome/browser/certificate_manager_model.h
net::NSSCertDatabase::ImportCertFailureList* not_imported);
  
  
  
  bool SetCertTrust(CERTCertificate* cert,
                    net::CertType type,
                    net::NSSCertDatabase::TrustBits trust_bits);
  
  
  bool Delete(CERTCertificate* cert);
 private:
  CertificateManagerModel(net::NSSCertDatabase* nss_cert_database,
                          bool is_user_db_available);
  
  
  static void DidGetCertDBOnUIThread(net::NSSCertDatabase* cert_db,
                                     bool is_user_db_available,
                                     const CreationCallback& callback);
  static void DidGetCertDBOnIOThread(const CreationCallback& callback,
                                     net::NSSCertDatabase* cert_db);
  static void GetCertDBOnIOThread(content::ResourceContext* context,
                                  const CreationCallback& callback);
  net::NSSCertDatabase* cert_db_;
  
  
  bool is_user_db_available_;
  DISALLOW_COPY_AND_ASSIGN(CertificateManagerModel);
};
#endif