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This reverts commit f4a585a3.

Reason for revert: This CL causes failures of SettingsUIBrowserTest.All
The first failed build: https://ci.chromium.org/p/chromium/builders/ci/Linux%20CFI/14356

Original change's description:
> WebUI: Remove --cr-list-item-focus and --cr-selectable-focus mixins
> 
> This CL removes the unused --cr-list-item-focus mixin and moves all
> the CSS properties/values from --cr-selectable-focus to the only
> place where they were being used.
> 
> https://imgur.com/a/yFz9k61
> 
> Bug: 973674
> Change-Id: I95f93fcfee6dc7b77ce5180a7875a1b526f066e5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1710852
> Reviewed-by: Hector Carmona <hcarmona@chromium.org>
> Commit-Queue: John Lee <johntlee@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#679323}

TBR=hcarmona@chromium.org,johntlee@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 973674
Change-Id: I777671fc0d62f5a307a410c4d9b8b108aa5ef83d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715691Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
Commit-Queue: Maxim Kolosovskiy <kolos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680430}