cros_generate_breakpad_symbols: use cros_build_lib.Open helper

No need to duplicate the logic here.

BUG=None
TEST=`./buildbot/run_tests` passes

Change-Id: Ic11d27a02da573872f64a8e452ace0b6d9c08289
Reviewed-on: https://chromium-review.googlesource.com/185583
Reviewed-by: Yu-Ju Hong <yjhong@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed