Remove commented-out test code

This has been commented out for 5 years, and NaCl is deprecated so it
is very unlikely that this will be uncommented in the future. If this
is needed in the future, we can restore it from the source control
history.

Change-Id: Ic841980d0039c9bdfaaec983890e3b75df9a1a3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5781762


Auto-Submit: Chris Fredrickson <cfredric@chromium.org>
Reviewed-by: Mark Seaborn <mseaborn@chromium.org>
Commit-Queue: Mark Seaborn <mseaborn@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1343866}