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 78ad623cbda87fa334d8ea738b465c6a064fec08..77ce8820cf4a4e0ea4bfdcd772fe67c6c851c63a 100644
--- a/chrome/browser/notifications/non_persistent_notification_handler.h
+++ b/chrome/browser/notifications/non_persistent_notification_handler.h
@@ -5,14 +5,9 @@
 #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 {
  public:
@@ -33,14 +28,7 @@ class NonPersistentNotificationHandler : public NotificationHandler {
 
   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);
 };