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The ternary operator here was backwards, with light mode colors being used
when the system is in dark mode, and vice versa.

Change-Id: Id6788f601a4cd741fb6ddce6ebe1aeb8fb44f1eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933386
Auto-Submit: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718800}