Write the assigned notification id to the stored notification data.

content/browser/notifications/notification_database.cc

Index: content/browser/notifications/notification_database.cc
diff --git a/content/browser/notifications/notification_database.cc b/content/browser/notifications/notification_database.cc
index 25350b952222dfef5cd58b34179bf6aa1bc2759d..f97ef4cf10ef04c20c9db29f4b565f097323fc12 100644
--- a/content/browser/notifications/notification_database.cc
+++ b/content/browser/notifications/notification_database.cc
@@ -189,16 +189,19 @@ NotificationDatabase::Status NotificationDatabase::WriteNotificationData(
   DCHECK(notification_id);
   DCHECK(origin.is_valid());
 
+  DCHECK_GE(next_notification_id_, kFirstNotificationId);
+
+  NotificationDatabaseData storage_data = notification_database_data;
+  storage_data.notification_id = next_notification_id_;
+
   std::string serialized_data;
-  if (!SerializeNotificationDatabaseData(notification_database_data,
+  if (!SerializeNotificationDatabaseData(storage_data,
                                          &serialized_data)) {
     DLOG(ERROR) << "Unable to serialize data for a notification belonging "
                 << "to: " << origin;
     return STATUS_ERROR_FAILED;
   }
 
-  DCHECK_GE(next_notification_id_, kFirstNotificationId);
-
   leveldb::WriteBatch batch;
   batch.Put(CreateDataKey(origin, next_notification_id_), serialized_data);
   batch.Put(kNextNotificationIdKey,