The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4da8bd2b4f14146ec9af58f0556ad9449f0b44aa

commit 4da8bd2b4f14146ec9af58f0556ad9449f0b44aa
Author: Morten Stenshorne <mstensho@chromium.org>
Date: Fri Aug 24 19:50:02 2018

Update UA stylesheet for fieldset.

Should use min-inline-size instead of min-width, so that it works as
intended in vertical writing modes too. See
https://github.com/whatwg/html/pull/3914

Bug:  874053 
Change-Id: I4fd4bd74606721bb44170a926f8be3d98a67db3e
Reviewed-on: https://chromium-review.googlesource.com/1188678
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585951}
[delete] https://crrev.com/965e625caa172647757ccf98e7a52abb9f6bf735/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-element-0/min-inline-size-expected.txt
[modify] https://crrev.com/4da8bd2b4f14146ec9af58f0556ad9449f0b44aa/third_party/blink/renderer/core/css/html.css