common.sh: drop unused check_for_xxx helpers

I can't seem to find any users of this in this repo (including in the
history).  cs/ suggests there aren't any now either.  Drop them.

BUG=None
TEST=precq passes

Change-Id: I92595b1fa2a21bf1db0038b8700fe4989ad2bcfe
Reviewed-on: https://chromium-review.googlesource.com/1483761
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
1 file changed