[ObjC ARC] Converts ios/chrome/browser/ui/dialogs:dialogs_internal to ARC.

ios/chrome/browser/ui/dialogs/nsurl_protection_space_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/chrome/browser/ui/dialogs/nsurl_protection_space_util.h"
 
-#import "base/mac/scoped_nsobject.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/strings/grit/components_strings.h"
 #include "components/url_formatter/elide_url.h"
 #include "ui/base/l10n/l10n_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 ios_internal {
 namespace nsurlprotectionspace_util {
 
 NSString* MessageForHTTPAuth(NSURLProtectionSpace* protectionSpace) {
   DCHECK(CanShow(protectionSpace));
 
   if (protectionSpace.receivesCredentialSecurely)
     return RequesterIdentity(protectionSpace);
 
   NSString* securityWarning =
@@ skipping 34 matching lines @@
 GURL RequesterOrigin(NSURLProtectionSpace* protectionSpace) {
   std::string scheme = base::SysNSStringToUTF8(protectionSpace.protocol);
   std::string host = base::SysNSStringToUTF8(protectionSpace.host);
   uint16_t port = base::checked_cast<uint16_t>(protectionSpace.port);
 
   return GURL(url::SchemeHostPort(scheme, host, port).Serialize());
 }
 
 }  // namespace nsurlprotectionspace_util
 }  // namespace ios_internal