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This callback can be called more than once, for example once for a
differential update and then (if that fails) again for a full update.

Bug: 1071475
Change-Id: I6d5ebce996aa13ece5b5d1d088eb1a9fff31d2c0
Fixed: 1071475
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159534
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761115}