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The lucicfg vars defined under versioneds/vars were used as the
mechanism to abstract the channel branch details away from the milestone
configuration. Since the channel details have been removed, the
milestone configuration can now be expressed more simply as simple
constants in a milestone specific vars file.

Bug: 1062828
Change-Id: I9ccf3b08d5253f85cdd70b6bbb38f5e0ba137013
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2122240
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754508}