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Patch by Go MAEDA.
git-svn-id: http://svn.redmine.org/redmine/trunk@17976 e93f8b46-1217-0410-a6f0-8f06a7374b81
Custom async_* delivery methods are removed in favor of ActiveJob (Async by default).
git-svn-id: http://svn.redmine.org/redmine/trunk@17588 e93f8b46-1217-0410-a6f0-8f06a7374b81