Garden-o-matic: Fix rebaseline-json results handling

Tools/GardeningServer/scripts/checkout.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 64 matching lines @@
         for (var i = 0; i < failureInfoList.length; i++) {
             var failureInfo = failureInfoList[i];
             if (failureInfo.builderName.indexOf('dbg') != -1) {
                 debugBotsCallback(failureInfo);
                 continue;
             }
             tests[failureInfo.testName] = tests[failureInfo.testName] || {};
             tests[failureInfo.testName][failureInfo.builderName] =
                 base.uniquifyArray(base.flattenArray(failureInfo.failureTypeList.map(results.failureTypeToExtensionList)));
         }
-        return net.post('/rebaselineall', JSON.stringify(tests));
+        net.post('/rebaselineall', JSON.stringify(tests)).then(progressCallback, progressCallback);
     });
 };
 
 })();