[CQ] Use non-luci fuchsia bots for cq experiment

This proceeds the experiment using the legacy bots, since luci bots
are blocked on https://crbug.com/776734.

NOTRY=true

Bug: chromium:772816, chromium:776734
Change-Id: I7532e04e98a96d69dbeefcd6edf66fb0cddbe111
Reviewed-on: https://chromium-review.googlesource.com/743365Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49034}

infra/config/cq.cfg

@@ -23,10 +23,6 @@ verifiers {
   try_job {
     buckets {
       name: "luci.v8.try"
-      builders {
-        name: "v8_fuchsia_rel_ng"
-        experiment_percentage: 100
-      }
       builders {
         name: "v8_linux_shared_compile_rel"
       }
@@ -38,6 +34,10 @@ verifiers {
     buckets {
       name: "master.tryserver.v8"
       builders { name: "v8_android_arm_compile_rel" }
+      builders {
+        name: "v8_fuchsia_rel_ng"
+        experiment_percentage: 100
+      }
       builders { name: "v8_node_linux64_rel" }
       builders { name: "v8_linux64_asan_rel_ng" }
       builders {