Protect ARRAY_SIZE macro from being #defined twice

BUG=chrome-os-partner:7459
TEST=none

Change-Id: I3664ad9db4a4e0cecd38443bf01f99531ba80972
Reviewed-on: https://gerrit.chromium.org/gerrit/22183
Commit-Ready: Bill Richardson <wfrichar@chromium.org>
Tested-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
1 file changed