gatekeeper.json: Fix excluded builders for infra cron

scripts/slave/gatekeeper.json

 {
   "comment": ["This is a configuration file for gatekeeper_ng.py",
               "Look at that for documentation on this file's format."],
 
   "masters": {
     "https://build.chromium.org/p/chromium": [
       {
         "categories": [
           "chromium_tree_closer"
         ],
@@ skipping 191 matching lines @@
         ]
       }
     ],
     "https://build.chromium.org/p/chromium.infra.cron": [
       {
         "builders": {
           "gnumbd": {
             "categories": [
               "chromium_gnumbd_closer"
             ]
-          }
+          },
+          "*":{}
         },
         "excluded_builders": [
           "lkgr-tag-pusher",
           "builder_alerts",
           "publish_tarball",
           "rebaseline-o-matic",
           "recipe-autoroller-public",
           "Chromium Linux Codesearch",
           "ChromiumOS Codesearch",
-          "git-hash-metrics"
+          "git-hash-metrics",
+          "w3c-test-autoroller"
         ]
       },
       {
         "close_tree": false,
         "tree_notify": [
           "chrome-troopers+alerts-staging@google.com"
         ],
 
         "subject_template": "Codesearch build failure on %(builder_name)s",
 
@@ skipping 748 matching lines @@
         "cleanup_temp",
         "taskkill"
       ],
       "closing_optional": [
         "compile",
         "gn"
       ]
     }
   }
 }