Migrate CustomizationWallpaperDownloader away from base::Bind and base::Closure.

Instead, base::BindOnce and base::OnceClosure are used.

This is driven-by CL that allows the presubmit hook to let other
changes to this file to be uploaded.

BUG=714018

Change-Id: I0adbfe6bc5a2195e52310bebcd5a1c00e85ef244
Reviewed-on: https://chromium-review.googlesource.com/1011304
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#550577}
1 file changed