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This changes the implementation around how dark mode is queried in CSS.

Bug: 965811
Change-Id: I6d45507907364cdccdeeb4273562e4f81664f74b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626350
Commit-Queue: Dan Beam <dbeam@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667331}