Remove legacy version check for Crostini

This CL removes checks that disable Crostini in M68 and earlier, which
are of course no longer needed as we are currently on M75.

Change-Id: I2893bc10b3140b3bbe1092af878cf6d556b294d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1514335
Auto-Submit: Timothy Loh <timloh@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639712}
2 files changed