Stop using CertStore which is not compatible with PlzNavigate.

ios/web/web_state/web_state_impl.mm

 // Copyright 2013 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/web_state/web_state_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/metrics/histogram_macros.h"
@@ skipping 327 matching lines @@
 bool WebStateImpl::IsShowingWebInterstitial() const {
   // Technically we could have |interstitial_| set but its view isn't
   // being displayed, but there's no code path where that could occur.
   return interstitial_ != nullptr;
 }
 
 WebInterstitial* WebStateImpl::GetWebInterstitial() const {
   return interstitial_;
 }
 
-int WebStateImpl::GetCertGroupId() const {
-  return request_tracker_->identifier();
-}
-
 net::HttpResponseHeaders* WebStateImpl::GetHttpResponseHeaders() const {
   return http_response_headers_.get();
 }
 
 void WebStateImpl::OnHttpResponseHeadersReceived(
     net::HttpResponseHeaders* response_headers,
     const GURL& resource_url) {
   // Store the headers in a map until the page finishes loading, as we do not
   // know which URL corresponds to the main page yet.
   // Remove the hash (if any) as it is sometimes altered by in-page navigations.
@@ skipping 336 matching lines @@
     const LoadCommittedDetails& load_details) {
   FOR_EACH_OBSERVER(WebStateObserver, observers_,
                     NavigationItemCommitted(load_details));
 }
 
 WebState* WebStateImpl::GetWebState() {
   return this;
 }
 
 }  // namespace web