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This CL changes hardcoded values to use their respective color
providers, allowing them to handle light/dark mode.

Test: manual
Bug: 1127498
Change-Id: I81b7a877dc0aff37d2fe080e6ee15ff73c094704
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444489
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813291}