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The original method declared the argument as OnceCallback:
https://cs.chromium.org/chromium/src/chrome/browser/offline_pages/background_loader_offliner.h?rcl=f1e0ecaf7d175cf0f4eb923daa10511be4b11931&l=75

This is part of the base::Callback migration.

Context: https://cs.chromium.org/chromium/src/docs/callback.md?rcl=9fcc3764aea8f97e9f6de4a9ee61d554e67edcda&l=40
Change-Id: I4f477760f4cf423d6352fd82041da75b2f0e1903
Bug: 714018
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031405Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Commit-Queue: Carlos Knippschild <carlosk@chromium.org>
Auto-Submit: Jose Lopes <jabolopes@google.com>
Cr-Commit-Position: refs/heads/master@{#739106}