Remove duplicated code in sysroot-creator.sh

BUG=751812
R=thestig@chromium.org

Change-Id: I3c84383bc4aa01e9cbe288da5c2f2080bfa38057
Reviewed-on: https://chromium-review.googlesource.com/764596
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515822}
1 file changed