Flush Channel IDs when Cookies get saved to a persistent backend

net/extras/sqlite/sqlite_channel_id_store.h

Index: net/extras/sqlite/sqlite_channel_id_store.h
diff --git a/net/extras/sqlite/sqlite_channel_id_store.h b/net/extras/sqlite/sqlite_channel_id_store.h
index 9a5901d293ae40260a50f9c3e31a37b2ba1ffb88..dbc6cf3a59b7744ded603bde51b42204c6ec5395 100644
--- a/net/extras/sqlite/sqlite_channel_id_store.h
+++ b/net/extras/sqlite/sqlite_channel_id_store.h
@@ -40,6 +40,7 @@ class SQLiteChannelIDStore : public DefaultChannelIDStore::PersistentStore {
   void DeleteChannelID(
       const DefaultChannelIDStore::ChannelID& channel_id) override;
   void SetForceKeepSessionState() override;
+  void Flush() override;
 
   // Delete channel ids from servers in |server_identifiers|.
   void DeleteAllInList(const std::list<std::string>& server_identifiers);