Revert of Minimize the delegate dependencies for non persistent notifications.

content/public/browser/notification_event_dispatcher.h

Index: content/public/browser/notification_event_dispatcher.h
diff --git a/content/public/browser/notification_event_dispatcher.h b/content/public/browser/notification_event_dispatcher.h
index 5ffdc6f5e378d12affca695917a6995ef4bfa8b1..ce2261b3044b878d67a1110329b87ce2ecf792f5 100644
--- a/content/public/browser/notification_event_dispatcher.h
+++ b/content/public/browser/notification_event_dispatcher.h
@@ -32,9 +32,6 @@
   using NotificationDispatchCompleteCallback =
       base::Callback<void(PersistentNotificationStatus)>;
 
-  // Dispatch methods for persistent (SW backed) notifications.
-  // TODO(miguelg) consider merging them with the non persistent ones below.
-
   // Dispatches the "notificationclick" event on the Service Worker associated
   // with |notification_id| belonging to |origin|. The |callback| will be
   // invoked when it's known whether the event successfully executed.
@@ -59,15 +56,6 @@
       const NotificationDispatchCompleteCallback&
           dispatch_complete_callback) = 0;
 
-  // Dispatch methods for the different non persistent (not backed by a service
-  // worker) notification events.
-  virtual void DispatchNonPersistentShowEvent(
-      const std::string& notification_id) = 0;
-  virtual void DispatchNonPersistentClickEvent(
-      const std::string& notification_id) = 0;
-  virtual void DispatchNonPersistentCloseEvent(
-      const std::string& notification_id) = 0;
-
  protected:
   virtual ~NotificationEventDispatcher() {}
 };