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This simplifies the process of updating the buckets by moving the
defaults to a common location and highlighting the differences between
the versioned and master-only settings. Each file is no longer relying
on scoped defaults being set by another file executing it. It also has
the benefit of being able to see what is different between the branches
by doing a simple diff of the bucket files.

Change-Id: Ifc08e477c1d212a68f6cbe016ca93c4f1176501e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2158917
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762073}