Revisions are already spread across almost 30 XML files 1000 builds
each. Although it may take a considerable amount of time to download the
list, the progress bar doesn't reflect this process.
Because the downloading isn't deterministic, we try to update the
progress after each received file. 0.02 rate should be OK for user and
enough for around 2 years of Chromium builds before hitting bar's 90% limit.
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