Calculate border-box dimensions correctly for cells
When constraining a height on a cell according to box sizing we need to exclude the intrinsic
padding on table cells (calculated to line up the content of the cells with the
baseline of its neighbours) but include any collapsed borders the cells have
picked up from the row/table.
BUG=
627305
Committed:
https://crrev.com/1da432b8b1e60df27ed36d2a6439392d2048551e
Cr-Commit-Position: refs/heads/master@{#406775}