enter_chroot: delete ssh .pub key copy

This was added a long time ago for some test image logic in CL:3449,
but that has since been purged in CL:177667.  Clean up this bit of
code that doesn't help otherwise as only having access to .pub keys
in ~/.ssh doesn't grant access to anything.

TEST=CQ passes

Change-Id: Ib6ccc04fb723faca922f246b4ec5f50fc7c59645
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2204978
Reviewed-by: Alex Klein <saklein@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed