diff --git a/atom/browser/notifications/platform_notification_service.cc b/atom/browser/notifications/platform_notification_service.cc
index 2dda121b1c41..410315591ccd 100644
--- a/atom/browser/notifications/platform_notification_service.cc
+++ b/atom/browser/notifications/platform_notification_service.cc
@@ -122,7 +122,7 @@ void PlatformNotificationService::CloseNotification(
 
 void PlatformNotificationService::GetDisplayedNotifications(
     content::BrowserContext* browser_context,
-    const DisplayedNotificationsCallback& callback) {}
+    DisplayedNotificationsCallback callback) {}
 
 int64_t PlatformNotificationService::ReadNextPersistentNotificationId(
     content::BrowserContext* browser_context) {
diff --git a/atom/browser/notifications/platform_notification_service.h b/atom/browser/notifications/platform_notification_service.h
index aa485c2ad783..758eaf2c7f6a 100644
--- a/atom/browser/notifications/platform_notification_service.h
+++ b/atom/browser/notifications/platform_notification_service.h
@@ -43,7 +43,7 @@ class PlatformNotificationService
                          const std::string& notification_id) override;
   void GetDisplayedNotifications(
       content::BrowserContext* browser_context,
-      const DisplayedNotificationsCallback& callback) override;
+      DisplayedNotificationsCallback callback) override;
   int64_t ReadNextPersistentNotificationId(
       content::BrowserContext* browser_context) override;
   void RecordNotificationUkmEvent(