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The CSS rules in the --cr-section mixin are moved into the only CSS
class left using it. A TODO has been added to address the similarity
of cr-row and settings-box, but this should not be considered high
priority.

Bug: 973674
Change-Id: I34437c39cb38b6fe0568a243a1eee41900ab6490
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216646Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773978}