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Now that we no longer have multiple milestone-based buckets, it is safe
to refer directly to the bucket when referencing another builder, so the
builder_name function provides no value.

Change-Id: If64a68d4d6e3c153c5d832a656fc2976ef18c7a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576945
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834320}