Revert of [ObjC ARC] Converts ios/chrome/browser/ui/toolbar:toolbar to ARC.

ios/chrome/browser/ui/toolbar/toolbar_model_delegate_ios.mm

 // Copyright 2012 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.
 
 #import "ios/chrome/browser/ui/toolbar/toolbar_model_delegate_ios.h"
 
 #include "base/logging.h"
 #include "components/omnibox/browser/autocomplete_classifier.h"
 #include "components/omnibox/browser/autocomplete_input.h"
 #include "components/omnibox/browser/autocomplete_match.h"
 #include "components/prefs/pref_service.h"
 #include "ios/chrome/browser/autocomplete/autocomplete_scheme_classifier_impl.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #include "ios/chrome/browser/pref_names.h"
 #include "ios/chrome/browser/ssl/ios_security_state_tab_helper.h"
 #include "ios/shared/chrome/browser/tabs/web_state_list.h"
 #import "ios/web/public/navigation_item.h"
 #import "ios/web/public/navigation_manager.h"
 #import "ios/web/public/ssl_status.h"
 #import "ios/web/public/web_state/web_state.h"
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 ToolbarModelDelegateIOS::ToolbarModelDelegateIOS(WebStateList* web_state_list)
     : web_state_list_(web_state_list) {}
 
 ToolbarModelDelegateIOS::~ToolbarModelDelegateIOS() {}
 
 web::WebState* ToolbarModelDelegateIOS::GetActiveWebState() const {
   return web_state_list_->GetActiveWebState();
 }
 
 web::NavigationItem* ToolbarModelDelegateIOS::GetNavigationItem() const {
@@ skipping 65 matching lines @@
   auto* client = IOSSecurityStateTabHelper::FromWebState(web_state);
   security_state::SecurityInfo result;
   client->GetSecurityInfo(&result);
   return result.malicious_content_status !=
          security_state::MALICIOUS_CONTENT_STATUS_NONE;
 }
 
 const gfx::VectorIcon* ToolbarModelDelegateIOS::GetVectorIconOverride() const {
   return nullptr;
 }