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Define SnapshotFileCallback as a OnceCallback<> instead of a Callback<>.
While this CL does not directly touch any net::CompletionCallbacks, it
is a prerequisite for transitioning to net::CompletionOnceCallbacks in
//storage/browser/fileapi.

Bug: 807724

This exact CL has been reviewed and approved at
https://crrev.com/c/1165828.  However, due to a bug in Gerrit, I
inadvertently submitted that CL skipping the CQ.  See
https://crbug.com/872722.  Then I reverted that CL at
https://crrev.com/c/1169344.

In the aftermath of Gerrit issue, the original CL was automatically
reverted at https://crrev.com/c/1169845 to give the author (me) a
heads up that it needs to be relanded.  Before that, of course, the
revert was automatically reverted (that is, the original CL relanded)
at https://crrev.com/c/1169868 for the same reason.

Now that the outage is over, I can reland this CL properly,
using the CQ.  Original reviewer is TBR'd.

TBR=tzik@chromium.org

Change-Id: I1a6fdfb53e0d38e8fd1d6618a4a79f52dcf4739b
Reviewed-on: https://chromium-review.googlesource.com/1169308
Commit-Queue: Bence Béky <bnc@chromium.org>
Reviewed-by: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582138}