DevTools: WI.Throttler goes promisified.

Source/devtools/front_end/bindings/WorkspaceController.js

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 32 matching lines @@
 WebInspector.WorkspaceController.prototype = {
     /**
      * @param {!Event} event
      */
     _windowFocused: function(event)
     {
         this._fileSystemRefreshThrottler.schedule(refreshFileSystems.bind(this));
 
         /**
          * @this {WebInspector.WorkspaceController}
-         * @param {!WebInspector.Throttler.FinishCallback} callback
          */
-        function refreshFileSystems(callback)
+        function refreshFileSystems()
         {
             var barrier = new CallbackBarrier();
             var projects = this._workspace.projects();
             for (var i = 0; i < projects.length; ++i)
                 projects[i].refresh("/", barrier.createCallback());
-            barrier.callWhenDone(callback);
+            return barrier.donePromise();
         }
     }
 }