Remove TODO that is already done
Uncomment two working tests.

Bug: v8:5751
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Icb28d84e92812996c2928e90961d75508ba4c401
Reviewed-on: https://chromium-review.googlesource.com/c/1296933Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56961}