Add win_rel bot again
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index f97699b..84ba265 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -19,8 +19,7 @@
       name: "luci.goma-client-external.try"
       builders { name: "linux_rel" }
       builders { name: "mac_rel" }
-      # omit win_rel bot until toolchain problem is solved. crbug.com/800246
-      #builders { name: "win_rel" }
+      builders { name: "win_rel" }
     }
   }
 }