[Chrome OS] Plumb new error codes from SignedSettings to consumers of the API

chrome/browser/chromeos/login/login_performer.cc

Index: chrome/browser/chromeos/login/login_performer.cc
diff --git a/chrome/browser/chromeos/login/login_performer.cc b/chrome/browser/chromeos/login/login_performer.cc
index 10f01205a9dc7890ddb5a8aa4e8dcb274846b818..5dd85ff50b22b40fee295d49341cb05fb6436464 100644
--- a/chrome/browser/chromeos/login/login_performer.cc
+++ b/chrome/browser/chromeos/login/login_performer.cc
@@ -156,9 +156,9 @@ void LoginPerformer::OnPasswordChangeDetected(
 ////////////////////////////////////////////////////////////////////////////////
 // LoginPerformer, SignedSettingsHelper::Callback implementation:
 
-void LoginPerformer::OnCheckWhiteListCompleted(bool success,
+void LoginPerformer::OnCheckWhitelistCompleted(SignedSettings::ReturnCode code,
                                                const std::string& email) {
-  if (success) {
+  if (code == SignedSettings::SUCCESS) {
     // Whitelist check passed, continue with authentication.
     StartAuthentication();
   } else {