Convert garden-o-matic guts over to promises where appropriate

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 316 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(base.createLinkNode(trac.changesetURL(totRevision), totRevision));
 
-        checkout.lastBlinkRollRevision(function(revision) {
+        checkout.lastBlinkRollRevision().then(function(revision) {
             theSpan.appendChild(document.createTextNode(', last roll is to '));
             theSpan.appendChild(base.createLinkNode(trac.changesetURL(revision), revision));
         }, function() {});
 
-        rollbot.fetchCurrentRoll(function(roll) {
+        rollbot.fetchCurrentRoll().then(function(roll) {
             theSpan.appendChild(document.createTextNode(', current autoroll '));
             if (roll) {
                 var linkText = "" + roll.fromRevision + ":" + roll.toRevision;
                 theSpan.appendChild(base.createLinkNode(roll.url, linkText));
                 if (roll.isStopped)
                     theSpan.appendChild(document.createTextNode(' (STOPPED) '));
             } else {
                 theSpan.appendChild(document.createTextNode(' None'));
             }
         });
     }
 });
 
 })();