Migrate v8_presubmit to LUCI

R=machenbach@chromium.org

Bug: chromium:748057
Change-Id: I013bae778c3cc1ccf545d33bf99aadb42ad49834
Reviewed-on: https://chromium-review.googlesource.com/775122
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49448}

infra/config/cq.cfg

@@ -30,6 +30,7 @@ verifiers {
         name: "v8_win64_msvc_compile_rel"
         experiment_percentage: 20
       }
+      builders { name: "v8_presubmit" }
     }
     buckets {
       name: "master.tryserver.v8"
@@ -96,7 +97,6 @@ verifiers {
         name: "v8_mac_rel_ng_triggered"
         triggered_by: "v8_mac_rel_ng"
       }
-      builders { name: "v8_presubmit" }
       builders { name: "v8_win64_rel_ng" }
       builders {
         name: "v8_win64_rel_ng_triggered"