cros: Implement cryptohome backend for pin.

chrome/browser/chromeos/login/quick_unlock/quick_unlock_notification_controller.cc

Index: chrome/browser/chromeos/login/quick_unlock/quick_unlock_notification_controller.cc
diff --git a/chrome/browser/chromeos/login/quick_unlock/quick_unlock_notification_controller.cc b/chrome/browser/chromeos/login/quick_unlock/quick_unlock_notification_controller.cc
index edf5f392d679a48ec378b529e2148a89c89f6bd9..a11c7b43bbb2b7b56276ee0ace98b7c3c1bcdbea 100644
--- a/chrome/browser/chromeos/login/quick_unlock/quick_unlock_notification_controller.cc
+++ b/chrome/browser/chromeos/login/quick_unlock/quick_unlock_notification_controller.cc
@@ -94,13 +94,7 @@ bool QuickUnlockNotificationController::ShouldShowPinNotification(
   if (!IsPinEnabled(profile->GetPrefs()))
     return false;
 
-  // Do not show the notification if the pin is already set.
-  PinStorage* pin_storage =
-      QuickUnlockFactory::GetForProfile(profile)->pin_storage();
-  if (pin_storage->IsPinSet())
-    return false;
-
-  // TODO(jdufault): Enable once quick unlock settings land(crbug.com/291747).
+  // TODO(jdufault): Do not show the notification if the pin is already set.
   return false;
 }