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This CL adds a PRESUBMIT to ui/chromeos/colors that greps through the
codebase for generated CSS variables for any removed colors.

Bug: 1018654
Change-Id: I011a035a6d8c28e913ebdc31f8b3f2ea88e38952
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315370
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Jiewei Qian  <qjw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792584}