Revert "[CQ] Temporarily exclude broken bot from CQ"

This reverts commit 0d910860.

Reason for revert: Bot is fixed again.

Original change's description:
> [CQ] Temporarily exclude broken bot from CQ
> 
> TBR=neis@chromium.org
> 
> Change-Id: I59903a40c1ca47cce3e5744c51a2abda93e45dad
> Reviewed-on: https://chromium-review.googlesource.com/567931
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46580}

TBR=machenbach@chromium.org,neis@chromium.org

Bug: chromium:741505
Change-Id: I47068e6364e8b417b75ffd687e7758c41fc0ed0f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/569738Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46616}

infra/config/cq.cfg

@@ -69,10 +69,7 @@ verifiers {
         name: "v8_linux_arm_rel_ng_triggered"
         triggered_by: "v8_linux_arm_rel_ng"
       }
-      builders {
-        name: "v8_linux_chromium_gn_rel"
-        experiment_percentage: 100
-      }
+      builders { name: "v8_linux_chromium_gn_rel" }
       builders { name: "v8_linux_dbg_ng" }
       builders {
         name: "v8_linux_dbg_ng_triggered"