Remove checkout functionality from GOM

Tools/GardeningServer/scripts/ui.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 392 matching lines @@
         $(summaryLinkNode).mouseout(function(ev) {
             if (!revisionsNode.open) {
                 $(revisionsPopUp).removeClass("active");
             }
         });
 
         var totRevision = model.latestRevision();
         theSpan.appendChild(document.createTextNode(', trunk is at '));
         theSpan.appendChild(ui.createLinkNode(trac.changesetURL(totRevision), totRevision));
 
-        Promise.all([checkout.lastBlinkRollRevision(), rollbot.fetchCurrentRoll()]).then(function(results) {
-            theSpan.lastRolledRevision = results[0];
-            theSpan.roll = results[1];
-            theSpan.updateUI(totRevision);
-        });
+        // We want this feature, but need to fetch the lastBlinkRollRevision via the interwebs.
+        // Promise.all([checkout.lastBlinkRollRevision(), rollbot.fetchCurrentRoll()]).then(function(results) {
+        //     theSpan.lastRolledRevision = results[0];
+        //     theSpan.roll = results[1];
+        //     theSpan.updateUI(totRevision);
+        // });
     }
 });
 
 })();