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With this CL, perf FYI builders sharding data can be generated by running:
$ ./tools/perf/generate_perf_sharding update -w perf-fyi -r

This CL also remove 'One Buildbot Step Test Builder' in
perf.fyi.json since the corresponding builder has been removed.

BUG:chromium:898832

Change-Id: I7caf239d55259b95418750bdecf3ccb4d6e94398
Reviewed-on: https://chromium-review.googlesource.com/c/1318682Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#607581}