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 48e114ff47522a985d1f2a6527ca604574814d90..5eafda32f31132174a3ac4fb97b490225feed7f6 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
@@ -81,11 +81,12 @@ 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(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