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E.g. var(--google-gray-refresh-700). The values on all of the pages
outside of settings had hard-coded colors.

Change-Id: Idefc2c9746f13f02521712a2e7740eaaca97b62f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523662
Commit-Queue: Curt Clemens <cclem@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825682}