Remove the OnError method from notification delegates.

content/browser/notifications/page_notification_delegate.cc

Index: content/browser/notifications/page_notification_delegate.cc
diff --git a/content/browser/notifications/page_notification_delegate.cc b/content/browser/notifications/page_notification_delegate.cc
index e7af1a4ae509aecf094775ca55a8523b1e980437..dacfffbfd22da5db3bdede2ead526dd7b294d480 100644
--- a/content/browser/notifications/page_notification_delegate.cc
+++ b/content/browser/notifications/page_notification_delegate.cc
@@ -26,14 +26,6 @@ void PageNotificationDelegate::NotificationDisplayed() {
   sender->Send(new PlatformNotificationMsg_DidShow(notification_id_));
 }
 
-void PageNotificationDelegate::NotificationError() {
-  RenderProcessHost* sender = RenderProcessHost::FromID(render_process_id_);
-  if (!sender)
-    return;
-
-  sender->Send(new PlatformNotificationMsg_DidError(notification_id_));
-}
-
 // TODO(peter): Remove |by_user| since we're not using that anywhere.
 void PageNotificationDelegate::NotificationClosed(bool by_user) {
   RenderProcessHost* sender = RenderProcessHost::FromID(render_process_id_);