Stop using CertStore which is not compatible with PlzNavigate.

chrome/browser/certificate_viewer.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/certificate_viewer.h"
-
-#include "content/public/browser/cert_store.h"
-#include "net/cert/x509_certificate.h"
-
-void ShowCertificateViewerByID(content::WebContents* web_contents,
-                               gfx::NativeWindow parent,
-                               int cert_id) {
-  scoped_refptr<net::X509Certificate> cert;
-  content::CertStore::GetInstance()->RetrieveCert(cert_id, &cert);
-  if (!cert.get()) {
-    // The certificate was not found. Could be that the renderer crashed before
-    // we displayed the page info.
-    return;
-  }
-  ShowCertificateViewer(web_contents, parent, cert.get());
-}