Bug 1560930 [wpt PR 17434] - [css-flexbox] Clamp the cross-size by the min/max size...

Bug 1560930 [wpt PR 17434] - [css-flexbox] Clamp the cross-size by the min/max size, a=testonly

Automatic update from web-platform-tests
[css-flexbox] Clamp the cross-size by the min/max size

...when computing the main-axis size of a flex item.

As per this change:
https://drafts.csswg.org/css-flexbox/#change-2018-used-cross-size

R=dgrogan@chromium.org, eae@chromium.org

Bug: 972576
Change-Id: I11a1ac14e2e0e44e39fcd45d4568874da2dcfce8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1672014
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: David Grogan <dgrogan@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671485}

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wpt-commits: cc0f6ffd9998bdc180d3c70354656f438d99f701
wpt-pr: 17434