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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/+/1710852Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679323}