Use chunk size 80 to produce less number of profraw files

Such that there is enough space on the bots to hold those files,
and the script can run to the end.

This will also be much faster as test shows, as shown by the led
run: https://ci.chromium.org/b/8721174578017493153.

Bug: 395162693
Change-Id: I0ad175d51876862be7acef3aaf253e8b25f2379b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6331058
Reviewed-by: Prakhar Asthana <[email protected]>
Commit-Queue: Prakhar Asthana <[email protected]>
Auto-Submit: Weizhong Xia <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1429094}
NOKEYCHECK=True
GitOrigin-RevId: a03787ae167a53eeb6c0e834ff82b64f1ef55588
1 file changed