This function is part of the TitleStorage Interface.
Attempt to cancel this file request in progress. This is a best-effort command and is not guaranteed to be successful if the request has completed before this function is called.
EOS_Success if cancel is successful, EOS_NoChange if request had already completed (can't be canceled), EOS_AlreadyPending if it's already been canceled before (this is a final state for canceled request and won't change over time).
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