cros: Implement cryptohome backend for pin.

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

 // Copyright 2017 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_factory.h"
 
 #include "chrome/browser/chromeos/login/quick_unlock/quick_unlock_storage.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ skipping 37 matching lines @@
 
 QuickUnlockFactory::QuickUnlockFactory()
     : BrowserContextKeyedServiceFactory(
           "QuickUnlockFactory",
           BrowserContextDependencyManager::GetInstance()) {}
 
 QuickUnlockFactory::~QuickUnlockFactory() {}
 
 KeyedService* QuickUnlockFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
-  return new QuickUnlockStorage(
-      Profile::FromBrowserContext(context)->GetPrefs());
+  return new QuickUnlockStorage(Profile::FromBrowserContext(context));
 }
 
 }  // namespace quick_unlock
 }  // namespace chromeos