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It seems --shard-index is always specified now.

This is partial re-land of https://crrev.com/c/2639441

Bug: 1127205
Cq-Include-Trybots: luci.chromium.try:chromeos-kevin-rel
Change-Id: If26fc49d61581635ae9260805d982768e285823a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640526
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845716}