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

Tools/GardeningServer/scripts/svn-log.js

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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
@@ skipping 87 matching lines @@
 
 trac.changesetURL = function(revision)
 {
     var queryParameters = {
         view: 'rev',
         revision: revision,
     };
     return config.kBlinkRevisionURL + '?' + $.param(queryParameters);
 };
 
-trac.recentCommitData = function(path, limit, callback)
+trac.recentCommitData = function(path, limit)
 {
-    net.xml('http://blink.lc/blink/atom').then(function(commitData) {
-        callback(parseCommitData(commitData));
+    return net.xml('http://blink.lc/blink/atom').then(function(commitData) {
+        return parseCommitData(commitData);
     });
 };
 
-trac.commitDataForRevisionRange = function(path, startRevision, endRevision, callback)
-{
-    var key = [path, startRevision, endRevision].join('\n');
-    g_cache.get(key, callback);
-};
-
 })();