Convert WindowOpenDisposition to an enum class.

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/common/strings/grit/ash_strings.h"
 #include "ash/common/system/system_notifier.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 100 matching lines @@
 void QuickUnlockNotificationController::Close(bool by_user) {
   if (by_user)
     UpdatePreferenceForProfile(profile_);
 }
 
 // message_center::NotificationDelegate override:
 void QuickUnlockNotificationController::Click() {
   chrome::NavigateParams params(profile_,
                                 GURL(kChromeAuthenticationSettingsURL),
                                 ui::PAGE_TRANSITION_LINK);
-  params.disposition = NEW_FOREGROUND_TAB;
+  params.disposition = WindowOpenDisposition::NEW_FOREGROUND_TAB;
   params.window_action = chrome::NavigateParams::SHOW_WINDOW;
   chrome::Navigate(&params);
 
   UpdatePreferenceForProfile(profile_);
 
   // Remove the notification from tray.
   g_browser_process->notification_ui_manager()->CancelById(
       id(), NotificationUIManager::GetProfileID(profile_));
 }
 
@@ skipping 16 matching lines @@
       ui::ResourceBundle::GetSharedInstance().GetImageNamed(
           IDR_SCREENSHOT_NOTIFICATION_ICON),
       message_center::NotifierId(message_center::NotifierId::SYSTEM_COMPONENT,
                                  ash::system_notifier::kNotifierQuickUnlock),
       l10n_util::GetStringUTF16(
           IDS_MESSAGE_CENTER_NOTIFIER_QUICK_UNLOCK_FEATURE_NAME),
       GURL(), kNotificationId, message_center::RichNotificationData(), this);
 }
 
 }  // namespace chromeos