GitLab

Making a few things private that should be private, renaming "ids" to
"topics", updating comments etc. No functional changes.

Bug: 1029698
Change-Id: If95081e1b68277bc0beb1e17b23dde0b4791a010
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948438
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721504}