Update table.deleteRow(-1) to latest spec

Update table.deleteRow(-1) behavior to latest spec, the
change is that if there are no rows left to delete we do
nothing instead of throwing an IndexSizeError exception.

BUG=657837

Review-Url: https://codereview.chromium.org/2427963004
Cr-Commit-Position: refs/heads/master@{#427073}
2 files changed