Show different error message if ARC is disabled.

chrome/browser/chromeos/arc/auth/arc_robot_auth_code_fetcher.cc

 // 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.
 
 #include "chrome/browser/chromeos/arc/auth/arc_robot_auth_code_fetcher.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 63 matching lines @@
   fetch_request_job_.reset();
 
   if (status == policy::DM_STATUS_SUCCESS &&
       (!response.has_service_api_access_response())) {
     LOG(WARNING) << "Invalid service api access response.";
     status = policy::DM_STATUS_RESPONSE_DECODING_ERROR;
   }
 
   if (status != policy::DM_STATUS_SUCCESS) {
     LOG(ERROR) << "Fetching of robot auth code failed. DM Status: " << status;
-    callback.Run(std::string());
+    callback.Run(ArcAuthInfoFetcher::Status::FAILURE, std::string());
     return;
   }
 
-  callback.Run(response.service_api_access_response().auth_code());
+  callback.Run(ArcAuthInfoFetcher::Status::SUCCESS,
+               response.service_api_access_response().auth_code());
 }
 
 }  // namespace arc