Implement 'Not secure' warning for non-secure pages in Incognito mode

ios/chrome/browser/ssl/ios_security_state_tab_helper.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_security_state_tab_helper.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
 #include "components/security_state/core/security_state.h"
+#include "ios/web/public/browser_state.h"
 #include "ios/web/public/navigation_item.h"
 #import "ios/web/public/navigation_manager.h"
 #import "ios/web/public/origin_util.h"
 #include "ios/web/public/security_style.h"
 #include "ios/web/public/ssl_status.h"
 #include "ios/web/public/web_state/web_state.h"
 #include "net/cert/x509_certificate.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ skipping 32 matching lines @@
       (ssl.content_status & web::SSLStatus::DISPLAYED_INSECURE_CONTENT) ? true
                                                                         : false;
   state->displayed_password_field_on_http =
       (ssl.content_status & web::SSLStatus::DISPLAYED_PASSWORD_FIELD_ON_HTTP)
           ? true
           : false;
   state->displayed_credit_card_field_on_http =
       (ssl.content_status & web::SSLStatus::DISPLAYED_CREDIT_CARD_FIELD_ON_HTTP)
           ? true
           : false;
+  state->is_incognito = web_state_->GetBrowserState()->IsOffTheRecord();
+
   return state;
 }