Revert of Implement support for closing mac native notifications

chrome/browser/ui/cocoa/notifications/notification_service_delegate.mm

Index: chrome/browser/ui/cocoa/notifications/notification_service_delegate.mm
diff --git a/chrome/browser/ui/cocoa/notifications/notification_service_delegate.mm b/chrome/browser/ui/cocoa/notifications/notification_service_delegate.mm
index 919ad464ef5a5271025968e30b4a83f239a62e01..78118dd48ea9bd6f9f47fbd89acbb239ca57f762 100644
--- a/chrome/browser/ui/cocoa/notifications/notification_service_delegate.mm
+++ b/chrome/browser/ui/cocoa/notifications/notification_service_delegate.mm
@@ -60,12 +60,4 @@
   [[connection_ remoteObjectProxy] notificationClick:response];
 }
 
-// _NSUserNotificationCenterDelegatePrivate
-- (void)userNotificationCenter:(NSUserNotificationCenter*)center
-               didDismissAlert:(NSUserNotification*)notification {
-  NSDictionary* response =
-      [NotificationResponseBuilder buildDictionary:notification];
-  [[connection_ remoteObjectProxy] notificationClick:response];
-}
-
 @end