[css-tables] Speculative workaround for crash

RecalcVisualOverflow might be trying to read a cell that's been removed
from the tree.

I've not been able to get this to repro on android or linux.

Bug: 956625
Change-Id: I1353bd537245fc458e9eeec48bd8861b70364cf7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617559
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: David Grogan <dgrogan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661121}
1 file changed