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Updating comments, removing some unused members and some typedefs that
are only used a single time.

Bug: none
Change-Id: Icc7f37f9f0d8d9d7f707a5db6955726d0668b41e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1889653Reviewed-by: Tatiana Gornak <melandory@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710733}