Convert CFI trybot to GN.
Convert CFI trybot to GN.

This CL is a follow-up to
https://codereview.chromium.org/1478863004/
and
https://codereview.chromium.org/1486883002/

BUG=568384

Review URL: https://codereview.chromium.org/1512213002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#364296}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk