Flip Mac CQ bots and matching waterfall bots to GN.

This affects:

tryserver.chromium.mac:
  - mac_chromium_compile_dbg_ng
  - mac_chromium_compile_rel_ng
  - mac_chromium_dbg_ng
  - mac_chromium_rel_ng
chromium.mac:
  - Mac Builder
  - Mac Builder (dbg)
chromium.gpu:
  - GPU Mac Builder
  - GPU Mac Builder (dbg)
chromium.gpu.fyi
  - GPU Mac Builder
  - GPU Mac Builder (dbg)

patch from issue 2046863005 at patchset 60001 (http://crrev.com/2046863005#ps60001)

R=dpranke@chromium.org
BUG=618468

Review-Url: https://codereview.chromium.org/2085483003
Cr-Commit-Position: refs/heads/master@{#400895}
2 files changed