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This CL converts the DeviceOAuth2TokenService::StatusCallback
from base::Callback to base::RepeatingCallback.

This is a code health CL, no behavior change is expected.

Bug: 1007635
Change-Id: I956bbc22308bcf92be9e971889ccf9d047f9fa00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2277097
Auto-Submit: Xida Chen <xidachen@chromium.org>
Reviewed-by: Anqing Zhao <anqing@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784371}