arc: Partially migrate mojo types

chrome/browser/chromeos/arc/arc_auth_service.cc

 // 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.
 
 #include "chrome/browser/chromeos/arc/arc_auth_service.h"
 
 #include <utility>
 
 #include "ash/common/shelf/shelf_delegate.h"
 #include "ash/common/wm_shell.h"
@@ skipping 146 matching lines @@
         auth_callback_.Run(auth_code, is_enforced);
         break;
       case CallbackType::AUTH_CODE_AND_ACCOUNT:
         DCHECK(!auth_account_callback_.is_null());
         auth_account_callback_.Run(auth_code, is_enforced, account_type);
         break;
       case CallbackType::ACCOUNT_INFO:
         DCHECK(!account_info_callback_.is_null());
         mojom::AccountInfoPtr account_info = mojom::AccountInfo::New();
         if (!is_enforced) {
-          account_info->auth_code = nullptr;
+          account_info->auth_code = base::nullopt;
         } else {
           account_info->auth_code = auth_code;
         }
         account_info->account_type = account_type;
         account_info->is_managed = is_managed;
         account_info_callback_.Run(std::move(account_info));
         break;
     }
   }
 
@@ skipping 968 matching lines @@
       return os << "FETCHING_CODE";
     case ArcAuthService::State::ACTIVE:
       return os << "ACTIVE";
     default:
       NOTREACHED();
       return os;
   }
 }
 
 }  // namespace arc