Converts ios/web/net to ARC.

ios/web/net/crw_ssl_status_updater.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.
 
 #import "ios/web/net/crw_ssl_status_updater.h"
 
 #import "base/ios/weak_nsobject.h"
 #import "base/mac/scoped_nsobject.h"
 #import "base/strings/sys_string_conversions.h"
 #include "ios/web/public/cert_store.h"
 #import "ios/web/public/navigation_item.h"
 #import "ios/web/public/navigation_manager.h"
 #include "ios/web/public/ssl_status.h"
 #import "ios/web/web_state/wk_web_view_security_util.h"
 #include "net/cert/x509_certificate.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using base::ScopedCFTypeRef;
 using net::CertStatus;
 using web::SecurityStyle;
 
 @interface CRWSSLStatusUpdater () {
   // DataSource for CRWSSLStatusUpdater.
   base::WeakNSProtocol<id<CRWSSLStatusUpdaterDataSource>> _dataSource;
   // Backs up property of the same name.
   base::WeakNSProtocol<id<CRWSSLStatusUpdaterDelegate>> _delegate;
 }
@@ skipping 161 matching lines @@
 
 - (void)didChangeSSLStatusForNavigationItem:(web::NavigationItem*)navItem {
   if ([_delegate respondsToSelector:
           @selector(SSLStatusUpdater:didChangeSSLStatusForNavigationItem:)]) {
     [_delegate SSLStatusUpdater:self
         didChangeSSLStatusForNavigationItem:navItem];
   }
 }
 
 @end