Cleanup bionic build script.
Cleanup bionic build script.

Clean up unreferences functions, and fix lint warning.

R=bradnelson@google.com
BUG=none

Review URL: https://codereview.chromium.org/400893006

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@13513 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client