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This CLs replaces all usage of the cr-section class with a new cr-row
class. It also removes uses of the class where there isn't much benefit
to using them and cleans up some of the HTML and CSS that were used
to override the class.

Bug: 973674
Change-Id: I1c33ca05626bde382bd7fbd0b54b4ab3b86089dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134197
Commit-Queue: John Lee <johntlee@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756447}