Remove SSLStatus::security_style member and content::SecurityStyle

ios/chrome/browser/ssl/ios_chrome_security_state_model_client.mm

 // Copyright 2016 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/chrome/browser/ssl/ios_chrome_security_state_model_client.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
 #include "ios/web/public/navigation_item.h"
@@ skipping 42 matching lines @@
   security_state_model_->SetClient(this);
 }
 
 IOSChromeSecurityStateModelClient::~IOSChromeSecurityStateModelClient() {}
 
 void IOSChromeSecurityStateModelClient::GetSecurityInfo(
     security_state::SecurityStateModel::SecurityInfo* result) const {
   return security_state_model_->GetSecurityInfo(result);
 }
 
-bool IOSChromeSecurityStateModelClient::RetrieveCert(
-    scoped_refptr<net::X509Certificate>* cert) {
-  web::NavigationItem* item =
-      web_state_->GetNavigationManager()->GetVisibleItem();
-  if (!item || !item->GetSSL().certificate)
-    return false;
-
-  *cert = item->GetSSL().certificate;
-  return true;
-}
-
 bool IOSChromeSecurityStateModelClient::UsedPolicyInstalledCertificate() {
   return false;
 }
 
 bool IOSChromeSecurityStateModelClient::IsOriginSecure(const GURL& url) {
   return web::IsOriginSecure(url);
 }
 
 void IOSChromeSecurityStateModelClient::GetVisibleSecurityState(
     security_state::SecurityStateModel::VisibleSecurityState* state) {
   web::NavigationItem* item =
       web_state_->GetNavigationManager()->GetVisibleItem();
   if (!item || item->GetSSL().security_style == web::SECURITY_STYLE_UNKNOWN) {
     *state = security_state::SecurityStateModel::VisibleSecurityState();
     return;
   }
 
   state->connection_info_initialized = true;
   state->url = item->GetURL();
   const web::SSLStatus& ssl = item->GetSSL();
-  state->initial_security_level =
-      GetSecurityLevelForSecurityStyle(ssl.security_style);
   state->certificate = ssl.certificate;
   state->cert_status = ssl.cert_status;
   state->connection_status = ssl.connection_status;
   state->security_bits = ssl.security_bits;
   state->displayed_mixed_content =
       (ssl.content_status & web::SSLStatus::DISPLAYED_INSECURE_CONTENT) ? true
                                                                         : false;
 }