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nsITransactionListener::AddListener() and nsITransactionListener::RemoveListener() are of course virtual methods. Additionally, they are safe to call without grabbing the TransactionManager's instance with local variable. Therefore, if EditorBase has methods to add/remove transaction listener to/from its transaction manager, we don't need EditorBase::GetTransactionManager() anymore. So, this patch adds AddTransactionListener() and RemoveTransactionListener() to EditorBase and TransactionManager, and remove EditorBase::GetTransactionManager() (not nsIEditor's one). MozReview-Commit-ID: FkPa1YgfagD --HG-- extra : rebase_source : 8ef7796136804e3d7604c5ca5417fb3379606b93