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CSS mixins are no longer necessary and can be replaced with CSS vars.

Bug: 1167325
Change-Id: I39b304e8644c4df511952166f7b30c82d92d359e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2633399Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844821}