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This enables removing overrides to CalculatePreferredSize() that try to
return a fixed size to fit within a specific dialog width.

It also fixes infinite recursion in such overrides where there's no
LayoutManager and GetHeightForWidth() defaults to calling
GetPreferredSize(), which calls the CalculatePreferredSize() override
that calls GetHeightForWidth().

Bug: 1128500
Change-Id: I75508e790cd6d7fdc31a40b5dad96366ddf8545c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466141
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816403}