nsDBFolderInfo::RemovePrefObserver();
void nsMsgDBModule::Shutdown(){	nsMsgDatabase::CleanupCache();    // Release the factory objects    mMailDBFactory = null_nsCOMPtr();    mNewsDBFactory = null_nsCOMPtr();    mImapDBFactory = null_nsCOMPtr();    mMsgRetentionSettingsFactory = null_nsCOMPtr();    mMsgDownloadSettingsFactory = null_nsCOMPtr();}