Convert WindowOpenDisposition to an enum class.

chrome/browser/notifications/extension_welcome_notification.cc

 // Copyright 2014 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/notifications/extension_welcome_notification.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 70 matching lines @@
   void MarkAsDismissed() {
     profile_->GetPrefs()->SetBoolean(prefs::kWelcomeNotificationDismissedLocal,
                                      true);
   }
 
   void OpenNotificationLearnMoreTab() {
     chrome::NavigateParams params(
         profile_,
         GURL(chrome::kNotificationWelcomeLearnMoreURL),
         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);
   }
 
   void DisableNotificationProvider() {
     message_center::Notifier notifier(notifier_id_, base::string16(), true);
     message_center::MessageCenter* message_center =
         delegate_->GetMessageCenter();
     message_center->DisableNotificationsByNotifier(notifier_id_);
     message_center->RemoveNotification(welcome_notification_id_, false);
@@ skipping 250 matching lines @@
       prefs::kWelcomeNotificationExpirationTimestamp,
       (delegate_->GetCurrentTime() +
           base::TimeDelta::FromDays(kRequestedShowTimeDays)).ToInternalValue());
 }
 
 bool ExtensionWelcomeNotification::IsWelcomeNotificationExpired() const {
   const base::Time expiration_timestamp = GetExpirationTimestamp();
   return !expiration_timestamp.is_null() &&
          (expiration_timestamp <= delegate_->GetCurrentTime());
 }