fix: disable LayoutNG to prevent random crashes in selection calcuations #19808
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Upstream Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=992929
CL that caused it: https://chromium-review.googlesource.com/c/chromium/src/+/1598319
Even Chrome doesn't have LayoutNG enabled in C76 and if you try to turn it on Chrome violently crashes so I think we're right to turn this off.
In particular LayoutNG causes a crash when selecting "wbr" elements in certain fonts under certain layout conditions. (I can't be much more specific or do a repro outside of a Slack specific message).
Notes: Fixed occasional crashes while selecting text