Remove mac_chromium_asan_rel_ng CQ experiment to reduce pending queues
Remove mac_chromium_asan_rel_ng CQ experiment to reduce pending queues

See https://codereview.chromium.org/1597553003 and https://goto.google.com/lgaln
for more context.

BUG=none
R=sergiyb@chromium.org

Review URL: https://codereview.chromium.org/1611163002 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#370668}

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