[ARC] Converts part of ios/web/public to ARC.

ios/web/public/origin_util.mm

 // Copyright 2015 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/public/origin_util.h"
 
 #import <WebKit/WebKit.h>
 
 #include "base/numerics/safe_conversions.h"
 #include "base/strings/sys_string_conversions.h"
 #include "net/base/url_util.h"
 #include "url/gurl.h"
 #include "url/scheme_host_port.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace web {
 
 bool IsOriginSecure(const GURL& url) {
   if (url.SchemeIsCryptographic() || url.SchemeIsFile())
     return true;
 
   if (url.SchemeIsFileSystem() && url.inner_url() &&
       IsOriginSecure(*url.inner_url())) {
     return true;
   }
 
   std::string hostname = url.HostNoBrackets();
   if (net::IsLocalhost(hostname))
     return true;
 
   return false;
 }
 
 GURL GURLOriginWithWKSecurityOrigin(WKSecurityOrigin* origin) {
   if (!origin)
     return GURL();
 
   url::SchemeHostPort origin_tuple(base::SysNSStringToUTF8(origin.protocol),
                                    base::SysNSStringToUTF8(origin.host),
                                    base::checked_cast<uint16_t>(origin.port));
   return GURL(origin_tuple.Serialize());
 }
 
 }  // namespace web