We cannot use the content size (intrinsic block size) as min-height or
max-height (min-width or max-width, if writing mode is vertical).
Doing so would cause min-height to incorrectly override any specified
height or max-height that is less than the intrinsic block size, and
max-height to override any specified height that's greater than the
intrinsic block size. Do what the spec says [1] instead: max-height
to become 'none', and min-height to become 0.

This fixes the final rendering problem with Acid2 (this was about the
min-height issue). It now renders correctly with LayoutNG!

Since no other tests than Acid2 started to pass with this change, I wrote
a couple.

[1] https://www.w3.org/TR/CSS22/visudet.html#min-max-heights

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Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: Ic4f2c3c1dbc2bd66956ed4b270b08058999bc351
Reviewed-on: https://chromium-review.googlesource.com/960085
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Aleks Totic <atotic@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543018}