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They are currently compiled with the production code even though they
are never used in production.

Bug: 1148157
Change-Id: Ic115540344a42401c40601fd6167d33d2a8362d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2539217Reviewed-by: My Nguyen <myy@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827693}