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...and take the opportunity to prune and reorder enums.

Change-Id: I260f24bbe33781f27d41cf37296be0b84070f26f
Reviewed-on: https://chromium-review.googlesource.com/957163
Commit-Queue: Julia Tuttle <juliatuttle@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543775}