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This was broken by the GM2 style update. Since these constants are only used in the infobar, we can unconditionally use dark mode style.

Bug: 940900
Change-Id: I9da25d945da94e72c4e0c7d8a08dfd8ca021196c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539125
Auto-Submit: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644777}