Revert of Minimize the delegate dependencies for non persistent notifications.

chrome/browser/notifications/non_persistent_notification_handler.h

Index: chrome/browser/notifications/non_persistent_notification_handler.h
diff --git a/chrome/browser/notifications/non_persistent_notification_handler.h b/chrome/browser/notifications/non_persistent_notification_handler.h
index 77ce8820cf4a4e0ea4bfdcd772fe67c6c851c63a..78ad623cbda87fa334d8ea738b465c6a064fec08 100644
--- a/chrome/browser/notifications/non_persistent_notification_handler.h
+++ b/chrome/browser/notifications/non_persistent_notification_handler.h
@@ -5,8 +5,13 @@
 #ifndef CHROME_BROWSER_NOTIFICATIONS_NON_PERSISTENT_NOTIFICATION_HANDLER_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NON_PERSISTENT_NOTIFICATION_HANDLER_H_
 
+#include <unordered_map>
+
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "chrome/browser/notifications/notification_handler.h"
+
+class NotificationDelegate;
 
 // NotificationHandler implementation for non persistent notifications.
 class NonPersistentNotificationHandler : public NotificationHandler {
@@ -28,7 +33,14 @@
 
   void OpenSettings(Profile* profile) override;
 
+  void RegisterNotification(const std::string& notification_id,
+                            NotificationDelegate* delegate) override;
+
  private:
+  // map of delegate objects keyed by notification id.
+  std::unordered_map<std::string, scoped_refptr<NotificationDelegate>>
+      notifications_;
+
   DISALLOW_COPY_AND_ASSIGN(NonPersistentNotificationHandler);
 };