Enable PIN configuration settings.

chrome/browser/chromeos/login/quick_unlock/pin_storage.h

 // Copyright 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_PIN_STORAGE_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_PIN_STORAGE_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
 #include "base/time/time.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 class PrefService;
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }  // namespace user_prefs
 
 class PinStorageTestApi;
 
 namespace chromeos {
 
-// TODO(jdufault): Figure out the UX we want on the lock screen when there are
-// multiple users. We will be storing either global or per-user unlock state. If
-// we end up storing global unlock state, we can pull the unlock attempt and
-// strong-auth code out of this class.
-
 class PinStorage : public KeyedService {
  public:
   // TODO(jdufault): Pull these values in from policy. See crbug.com/612271.
   static const int kMaximumUnlockAttempts = 3;
   static const base::TimeDelta kStrongAuthTimeout;
 
   // Registers profile prefs.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
   explicit PinStorage(PrefService* pref_service);
@@ skipping 40 matching lines @@
   PrefService* pref_service_;
   int unlock_attempt_count_ = 0;
   base::Time last_strong_auth_;
 
   DISALLOW_COPY_AND_ASSIGN(PinStorage);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_PIN_STORAGE_H_