[CQ] Remove triggered experimental builder.

BUG=chromium:535160, chromium:561530
TBR=tandrii@chromium.org, sergiyb@chromium.org,
LOG=n
NOTRY=true

Review URL: https://codereview.chromium.org/1481763003

Cr-Commit-Position: refs/heads/master@{#32352}

infra/config/cq.cfg

@@ -48,11 +48,6 @@ verifiers {
         name: "v8_win64_rel_ng"
         experiment_percentage: 30
       }
-      builders {
-        name: "v8_win64_rel_ng_triggered"
-        triggered: false
-        experiment_percentage: 30
-      }
     }
   }