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These functions are used in hundreds of locations in the code base and
there's no ongoing effort to deprecate them. New developers are
sometimes confused when they write code that must use these functions.
Delete the comments discouraging their usage.

Bug: none
Change-Id: I4d40956edc6168340a361b762eb741723d47c8d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404949
Commit-Queue: James Cook <jamescook@chromium.org>
Commit-Queue: Stefan Kuhne <skuhne@chromium.org>
Reviewed-by: Stefan Kuhne <skuhne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805986}