Re: [whatwg/fetch] Allow .blob() to return disk-backed resource (#569)

> Chrome has to deal with blob references, so if you transfer the blob of a cached response to another thread, then delete the item from the cache, it needs to avoid deleting the disk entry until the blob is GCd.

Yea, we have to deal with the same thing.  We have a native stream representing the Cache body entry.  We need to keep the entry alive as long as that native stream is active.  This could be due to Blob code or something else (like respondWith, etc).

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