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These 3 enums are all private, so relatively easy to convert.

Bug: 720553
Change-Id: Ide43578b526677b8da9317decd550a12f40d3f80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377557Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802461}