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It is actually not used anywhere and only set in one place, so we can
do away with it.

Bug: None
Change-Id: Ib6f2445f2fb02dbcaac25caa3f0beae1c473fd56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816118
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698961}