Stop using CertStore which is not compatible with PlzNavigate.

ios/web/net/cert_store_impl.cc

-// Copyright 2015 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 "ios/web/net/cert_store_impl.h"
-
-namespace web {
-
-// static
-CertStore* CertStore::GetInstance() {
-  return CertStoreImpl::GetInstance();
-}
-
-//  static
-CertStoreImpl* CertStoreImpl::GetInstance() {
-  return base::Singleton<CertStoreImpl>::get();
-}
-
-int CertStoreImpl::StoreCert(net::X509Certificate* cert, int group_id) {
-  scoped_refptr<HashAndCert> hash_and_cert(new HashAndCert);
-  hash_and_cert->chain_hash =
-      net::X509Certificate::CalculateChainFingerprint256(
-          cert->os_cert_handle(), cert->GetIntermediateCertificates());
-  hash_and_cert->cert = cert;
-  return store_.Store(hash_and_cert.get(), group_id);
-}
-
-bool CertStoreImpl::RetrieveCert(int cert_id,
-                                 scoped_refptr<net::X509Certificate>* cert) {
-  scoped_refptr<HashAndCert> hash_and_cert;
-  if (store_.Retrieve(cert_id, &hash_and_cert)) {
-    *cert = hash_and_cert->cert;
-    return true;
-  }
-  return false;
-}
-
-void CertStoreImpl::RemoveCertsForGroup(int group_id) {
-  store_.RemoveForRequestTracker(group_id);
-}
-
-CertStoreImpl::CertStoreImpl() {}
-
-CertStoreImpl::~CertStoreImpl() {}
-
-CertStoreImpl::HashAndCert::HashAndCert() = default;
-
-bool CertStoreImpl::HashAndCert::LessThan::operator()(
-    const scoped_refptr<HashAndCert>& lhs,
-    const scoped_refptr<HashAndCert>& rhs) const {
-  return net::SHA256HashValueLessThan()(lhs->chain_hash, rhs->chain_hash);
-}
-
-CertStoreImpl::HashAndCert::~HashAndCert() = default;
-
-}  // namespace web