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File API needs the notion of a Blob URL store, that is applicable to units of related similar origin browsing contexts and to Workers. The Blob URL store is a list of Blob URLs and resources. The revocation list is processed at URL.revoke* and when the global script cleanup jobs list is processed (HTML). This will be used in conjunction with Bug 17765.
Fixed, see http://dev.w3.org/2006/webapi/FileAPI/#lifeTime