Migrate extension notifications to the new NotificationDisplayService

chrome/browser/extensions/api/notifications/notifications_api.h

Index: chrome/browser/extensions/api/notifications/notifications_api.h
diff --git a/chrome/browser/extensions/api/notifications/notifications_api.h b/chrome/browser/extensions/api/notifications/notifications_api.h
index d7bb4b712c7d7e59fb6f9af9192c560a3d711baf..1a21c1189656b464fc497bba6527de6f86067e90 100644
--- a/chrome/browser/extensions/api/notifications/notifications_api.h
+++ b/chrome/browser/extensions/api/notifications/notifications_api.h
@@ -20,6 +20,8 @@ namespace extensions {
 
 extern const base::Feature kAllowFullscreenAppNotificationsFeature;
 
+class ExtensionNotificationDisplayHelper;
+
 class NotificationsApiFunction : public ChromeAsyncExtensionFunction {
  public:
   // Whether the current extension and channel allow the API. Public for
@@ -40,6 +42,10 @@ class NotificationsApiFunction : public ChromeAsyncExtensionFunction {
 
   bool AreExtensionNotificationsAllowed() const;
 
+  // Returns the display helper that should be used for interacting with the
+  // common notification system.
+  ExtensionNotificationDisplayHelper* GetDisplayHelper() const;
+
   // Returns true if the API function is still allowed to run even when the
   // notifications for a notifier have been disabled.
   virtual bool CanRunWhileDisabled() const;