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Update styles for the dialog used with SplitSettingsSync to match
go/cros-sync-mock. Remove an unused style from the legacy dialog.

Legacy dialog (unchanged):
https://screenshot.googleplex.com/1P8qoyMnKOX

SplitSettingsSync dialog (updated):
https://screenshot.googleplex.com/mXsGDhWqWsC

Bug: 1023854
Change-Id: Iba6aaad03db7d9d457d8d32a15db4e51cb0e33df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006487
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733832}