cros: Implement cryptohome backend for pin.

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

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/login/quick_unlock/quick_unlock_notification_controller.h"
 
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/system/system_notifier.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 76 matching lines @@
   if (profile->GetPrefs()->GetBoolean(
           prefs::kPinUnlockFeatureNotificationShown)) {
     return false;
   }
 
   // Do not show notification if policy does not allow PIN, or if user is
   // supervised.
   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;
 }
 
 // static
 QuickUnlockNotificationController*
 QuickUnlockNotificationController::CreateForFingerprint(Profile* profile) {
   QuickUnlockNotificationController* controller =
       new QuickUnlockNotificationController(profile);
 
   // Set the fingerprint notification parameters.
@@ skipping 119 matching lines @@
       l10n_util::GetStringUTF16(params_.feature_name_id), GURL(),
       params_.notification_id, message_center::RichNotificationData(), this);
 }
 
 QuickUnlockNotificationController::NotificationParams::NotificationParams() {}
 
 QuickUnlockNotificationController::NotificationParams::~NotificationParams() {}
 
 }  // namespace quick_unlock
 }  // namespace chromeos