Handler settings page.

content/common/notification_type.h

Index: content/common/notification_type.h
diff --git a/content/common/notification_type.h b/content/common/notification_type.h
index 777f761efafae40fffc3dde7bede67d4ec32fbf8..1218551abe45c19115d203ec7e0de34a0be5f8ea 100644
--- a/content/common/notification_type.h
+++ b/content/common/notification_type.h
@@ -1298,6 +1298,10 @@ class NotificationType {
     // Sent when a new web store promo has been loaded.
     WEB_STORE_PROMO_LOADED,
 
+    // Protocol Handler Registry -----------------------------------------------
+    // Sent when a ProtocolHandlerRegistry is changed.
+    PROTOCOL_HANDLER_REGISTRY_CHANGED,
+
     // Count (must be last) ----------------------------------------------------
     // Used to determine the number of notification types.  Not valid as
     // a type parameter when registering for or posting notifications.