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This would also rename BuildBot class to TestResultsFetcher,
and rename the attribute buildbot to results_fetcher.

These classes have nothing to do with Buildbot, which is
no longer used. They do seem to be basically about fetching
results of tests that were run on bots.

Bug: 1002702
Change-Id: Ie877f4c16e8edde5023366a299dabb657a0ecd52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894618Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713977}