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
#ifndef CHROME_BROWSER_CERTIFICATE_MANAGER_MODEL_H_
#define CHROME_BROWSER_CERTIFICATE_MANAGER_MODEL_H_
#include <map>
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/strings/string16.h"
#include "net/cert/nss_cert_database.h"
namespace content {
class BrowserContext;