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This CL resolves an older TODO. With the LogBuffer now living in common/
instead of browser/, it is possible to do the serialization of these two enums
in common/ as well.

TBR=ftirelo@chromium.org

Bug: 928595
Change-Id: Ie9a0f8352b38202b1b87a269256ecf4e6e4421ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803925
Commit-Queue: Dominic Battré <battre@chromium.org>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697173}