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
const base::string16& password,
                       bool is_extractable,
                       net::ScopedCERTCertificateList* imported_certs);
  
  
  int ImportUserCert(const std::string& data);
  
  
  
  
  
  
  
  
  bool ImportCACerts(const net::ScopedCERTCertificateList& certificates,
                     net::NSSCertDatabase::TrustBits trust_bits,
                     net::NSSCertDatabase::ImportCertFailureList* not_imported);
  
  
  
  
  
  
  
  
  
  
  bool ImportServerCert(
      const net::ScopedCERTCertificateList& certificates,
      net::NSSCertDatabase::TrustBits trust_bits,