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Replaces CalculatePreferredSize() overrides. Change also replaces a few
DialogDelegate overrides with corresponding setters.

Bug: 1128500
Change-Id: If6a1048d0c3b560fa8bbfffed146ea982a75c502
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485619Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818677}