Re-enable use of goma on Windows.
Re-enable use of goma on Windows.

BUG=390764
TEST=NaCl trybots + Chromium's Windows trybot

Review URL: https://codereview.chromium.org/491213002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@13646 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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