当 Unity 即将从磁盘中删除资源时，则会调用此方法。
如果此方法已实现，则可通过此方法自行删除资源。 通过返回 AssetDeleteResult.FailedDelete 可防止删除文件 您不应在此回调内调用任何 Unity AssetDatabase API，最好保留文件操作或 VCS API。
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