Add a helper function, ,IsCellOrTableHeaderRole(), for ax table header
and update test results with the ax role of the table header.
The ax role for table header was updated with blink cl,
crrev.com/816423003.
This patch updates test results according to ax role from it.
BUG=
435081
Committed:
https://crrev.com/ff9c8d3025f375069298ae71407a31b6f58ee3dd
Cr-Commit-Position: refs/heads/master@{#311035}