Roll ChromeOS Arm AFDO profile from 140-7310.0-1754274574-benchmark-140.0.7339.6-r1 to 140-7310.0-1754274574-benchmark-140.0.7339.8-r1

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/cros-afdo-arm-chromium-beta
Please CC c-compiler-chrome@google.com,mobiletc-prebuild@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Chromium Beta Branch: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Tbr: mobiletc-prebuild@google.com
Merge-Approval-Bypass: Chrome autoroller
Change-Id: I65c042f913aa6b7b3e9ab3a6c2abc09421b878b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6830591
Commit-Queue: Chrome Release Autoroll <chromium-release-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: Chrome Release Autoroll <chromium-release-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/7339@{#177}
Cr-Branched-From: 27be8b77710f4405fdfeb4ee946fcabb0f6c92b2-refs/heads/main@{#1496484}
diff --git a/chromeos/profiles/arm.afdo.newest.txt b/chromeos/profiles/arm.afdo.newest.txt
index 5775236..40c395b 100644
--- a/chromeos/profiles/arm.afdo.newest.txt
+++ b/chromeos/profiles/arm.afdo.newest.txt
@@ -1 +1 @@
-chromeos-chrome-arm-none-140-7310.0-1754274574-benchmark-140.0.7339.6-r1-redacted.afdo.xz
+chromeos-chrome-arm-none-140-7310.0-1754274574-benchmark-140.0.7339.8-r1-redacted.afdo.xz