Show different error message if ARC is disabled.

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

Index: chrome/browser/chromeos/arc/auth/arc_robot_auth_code_fetcher.cc
diff --git a/chrome/browser/chromeos/arc/auth/arc_robot_auth_code_fetcher.cc b/chrome/browser/chromeos/arc/auth/arc_robot_auth_code_fetcher.cc
index 58bedb762d2fe7fa2e9128e73a8c2d1cd4209fb6..fe6a02defd9f6b8412667565629209376a6b99c8 100644
--- a/chrome/browser/chromeos/arc/auth/arc_robot_auth_code_fetcher.cc
+++ b/chrome/browser/chromeos/arc/auth/arc_robot_auth_code_fetcher.cc
@@ -79,11 +79,12 @@ void ArcRobotAuthCodeFetcher::OnFetchRobotAuthCodeCompleted(
 
   if (status != policy::DM_STATUS_SUCCESS) {
     LOG(ERROR) << "Fetching of robot auth code failed. DM Status: " << status;
-    callback.Run(std::string());
+    callback.Run(ArcAuthInfoFetchStatus::FAILURE, std::string());
     return;
   }
 
-  callback.Run(response.service_api_access_response().auth_code());
+  callback.Run(ArcAuthInfoFetchStatus::SUCCESS,
+               response.service_api_access_response().auth_code());
 }
 
 }  // namespace arc