Changing PRESUBMIT to match depot_tools.
Changing PRESUBMIT to match depot_tools.

This should fix a current issue which causes try jobs to trigger all builders.

BUG=None
TEST=trybots
R=phajdan.jr@chromium.org
TBR=phajdan.jr@chromium.org, sehr@chromium.org

Review URL: https://codereview.chromium.org/203123005

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12894 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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