[NOT FOR REVIEW] Significantly simplify the PlatformNotificationService //content API.

content/browser/notifications/page_notification_delegate.h

Index: content/browser/notifications/page_notification_delegate.h
diff --git a/content/browser/notifications/page_notification_delegate.h b/content/browser/notifications/page_notification_delegate.h
index fd45f9152bc25b5e20eb3cab6c53afa77ab71a05..9eefee08caf42a0555773ebb39b74dc9910fbb54 100644
--- a/content/browser/notifications/page_notification_delegate.h
+++ b/content/browser/notifications/page_notification_delegate.h
@@ -5,24 +5,27 @@
 #ifndef CONTENT_BROWSER_NOTIFICATIONS_PAGE_NOTIFICATION_DELEGATE_H_
 #define CONTENT_BROWSER_NOTIFICATIONS_PAGE_NOTIFICATION_DELEGATE_H_
 
-#include "content/public/browser/desktop_notification_delegate.h"
+#include "ui/message_center/notification_delegate.h"
 
 namespace content {
 
 // A delegate used by the notification service to report the results of platform
 // notification interactions to Web Notifications whose lifetime is tied to
 // that of the page displaying them.
-class PageNotificationDelegate : public DesktopNotificationDelegate {
+class PageNotificationDelegate : public message_center::NotificationDelegate {
  public:
   PageNotificationDelegate(int render_process_id, int notification_id);
-  ~PageNotificationDelegate() override;
 
-  // DesktopNotificationDelegate implementation.
-  void NotificationDisplayed() override;
-  void NotificationClosed() override;
-  void NotificationClick() override;
+  // message_center::NotificationDelegate implementation.
+  void Display() override;
+  void Close(bool by_user) override;
+  bool HasClickedListener() override;
+  void Click() override;
+  void ButtonClick(int button_index) override {}
 
  private:
+  ~PageNotificationDelegate() override;
+
   int render_process_id_;
   int notification_id_;
 };