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There are a few TODO(vabr) in the code. Some of them are about old
code-health improvements which proved to be unimportant enough to
consider, those are being removed in this CL. A few are still relevant
and have an associated bug filed, those are redirected to that bug
instead.

Bug: 908813, 397083, 415449, 543085
Change-Id: If506009ce54016f8a1d9680a90b6516b399af4aa
Reviewed-on: https://chromium-review.googlesource.com/c/1352186Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611292}