Merge the code paths for closing different kinds of notifications.

content/browser/notifications/notification_message_filter.h

Index: content/browser/notifications/notification_message_filter.h
diff --git a/content/browser/notifications/notification_message_filter.h b/content/browser/notifications/notification_message_filter.h
index 25d69c64f9325e62f6999205448dbb3c566d8316..eaba08ad9b1f908f4406f575deedfcde335792c9 100644
--- a/content/browser/notifications/notification_message_filter.h
+++ b/content/browser/notifications/notification_message_filter.h
@@ -73,12 +73,9 @@ class NotificationMessageFilter : public BrowserMessageFilter {
                           int64_t service_worker_registration_id,
                           const GURL& origin,
                           const std::string& filter_tag);
-  void OnClosePlatformNotification(const GURL& origin,
-                                   const std::string& tag,
-                                   int non_persistent_notification_id);
-  void OnClosePersistentNotification(const GURL& origin,
-                                     const std::string& tag,
-                                     const std::string& notification_id);
+  void OnCloseNotification(const GURL& origin,
+                           const std::string& tag,
+                           const std::string& notification_id);
 
   // Callback to be invoked by the notification context when the notification
   // data for the persistent notification may have been written, as indicated by