Revert of "Call the Close() event on a Notification when it's being replaced."

chrome/browser/notifications/message_center_notification_manager.cc

Index: chrome/browser/notifications/message_center_notification_manager.cc
diff --git a/chrome/browser/notifications/message_center_notification_manager.cc b/chrome/browser/notifications/message_center_notification_manager.cc
index ad4d8de8e642ffbc2491854ecd19be19cc39536f..d99a38b89392a444f52872d1e3c52b08b4a6fa7b 100644
--- a/chrome/browser/notifications/message_center_notification_manager.cc
+++ b/chrome/browser/notifications/message_center_notification_manager.cc
@@ -166,14 +166,6 @@ bool MessageCenterNotificationManager::Update(const Notification& notification,
       // the immediate update allowed in the message center.
       std::string old_id = old_notification->notification().id();
 
-      // The W3C Web Notifications specification states that replacing a
-      // notification should fire the "close" event on the old one. The WHATWG
-      // version does not include the "close" event at all anymore, so this
-      // will eventually become redundant.
-      // TODO(peter): Remove this call when removing the Close() event from
-      // Web Notifications. See http://crbug.com/437286.
-      old_notification->notification().delegate()->Close(false /* by_user */);
-
       // Add/remove notification in the local list but just update the same
       // one in MessageCenter.
       delete old_notification;