Remove the OnError method from notification delegates.

content/renderer/notification_provider.cc

Index: content/renderer/notification_provider.cc
diff --git a/content/renderer/notification_provider.cc b/content/renderer/notification_provider.cc
index 3c2a3c6e4e7c6106faf51a8aaa828a5b9e23b260..b5e749386cceeaa2b9b9e6d7cc32e0d79b095d40 100644
--- a/content/renderer/notification_provider.cc
+++ b/content/renderer/notification_provider.cc
@@ -118,7 +118,6 @@ bool NotificationProvider::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(NotificationProvider, message)
     IPC_MESSAGE_HANDLER(DesktopNotificationMsg_PostDisplay, OnDisplay);
-    IPC_MESSAGE_HANDLER(DesktopNotificationMsg_PostError, OnError);
     IPC_MESSAGE_HANDLER(DesktopNotificationMsg_PostClose, OnClose);
     IPC_MESSAGE_HANDLER(DesktopNotificationMsg_PostClick, OnClick);
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -139,15 +138,6 @@ void NotificationProvider::OnDisplay(int id) {
     notification.dispatchDisplayEvent();
 }
 
-void NotificationProvider::OnError(int id) {
-  WebNotification notification;
-  bool found = manager_.GetNotification(id, &notification);
-  // |found| may be false if the WebNotification went out of scope in
-  // the page before the error occurred.
-  if (found)
-    notification.dispatchErrorEvent(WebString());
-}
-
 void NotificationProvider::OnClose(int id, bool by_user) {
   WebNotification notification;
   bool found = manager_.GetNotification(id, &notification);