Fix ChromeOS debug buildbot failure.

chrome/browser/chromeos/login/user_manager.cc

Index: chrome/browser/chromeos/login/user_manager.cc
diff --git a/chrome/browser/chromeos/login/user_manager.cc b/chrome/browser/chromeos/login/user_manager.cc
index 381297aba3d05a5c220d741a05db0045f8e40884..3336622e8ce049afcd7c8196fe35e1cf1c76c743 100644
--- a/chrome/browser/chromeos/login/user_manager.cc
+++ b/chrome/browser/chromeos/login/user_manager.cc
@@ -256,8 +256,6 @@ UserManager::UserManager()
       current_user_is_owner_(false) {
   registrar_.Add(this, NotificationType::OWNER_KEY_FETCH_ATTEMPT_SUCCEEDED,
       NotificationService::AllSources());
-  registrar_.Add(this, NotificationType::OWNER_KEY_FETCH_ATTEMPT_FAILED,
-      NotificationService::AllSources());
 }
 
 UserManager::~UserManager() {
@@ -286,8 +284,7 @@ void UserManager::NotifyOnLogin() {
 void UserManager::Observe(NotificationType type,
                           const NotificationSource& source,
                           const NotificationDetails& details) {
-  if (type == NotificationType::OWNER_KEY_FETCH_ATTEMPT_SUCCEEDED ||
-      type == NotificationType::OWNER_KEY_FETCH_ATTEMPT_FAILED) {
+  if (type == NotificationType::OWNER_KEY_FETCH_ATTEMPT_SUCCEEDED) {
     ChromeThread::PostTask(ChromeThread::FILE, FROM_HERE,
         NewRunnableFunction(&CheckOwnership));
   }