make_chroot: drop python upgrade hack

Now that we're bootstrapping our SDK from newer versions, we can drop
this hack to make sure python is recent enough -- we know it is now.

BUG=chromium:747810
TEST=`cros tryjob chromiumos-sdk-tryjob` passes

Change-Id: I67ac843bda7c733382a077c03307aa8b8ce8a24e
Reviewed-on: https://chromium-review.googlesource.com/1756523
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
1 file changed