Move GardeningServer out of BuildSlaveSupport

Tools/GardeningServer/scripts/Builder.js

 /*
  * Copyright (C) 2011 Apple 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 220 matching lines @@
             var buildNames = buildNamesFromDirectoryXHR(xhr);
             self._cache[cacheKey] = buildNames;
             callback(buildNames);
         });
     },
 
     // Any successful runs of run-webkit-tests that took less than this number of seconds are
     // assumed to be errors.
     _minimumSuccessfulLayoutTestStepRunTime: 20,
 };