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Add a row for "Settings sync" per go/cros-sync-mock. Implement this by
forking the existing HTML because I anticipate other tweaks to the
structure, layout, etc.

Screenshot: https://screenshot.googleplex.com/jBQkUEZoT1O

Note that there are now 3 versions of this dialog:
* Current
* SplitSettingsSync v1
* SplitSyncConsent (aka SplitSettingsSync v2)

Bug: 1067212
Change-Id: I64861026cf66d59800511dc559669743410707a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134198
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756109}