DevTools: WI.Throttler goes promisified.

Source/devtools/front_end/elements/PropertiesWidget.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2014 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.
@@ skipping 46 matching lines @@
      * @param {!WebInspector.Event} event
      */
     _setNode: function(event)
     {
         this._node = /** @type {?WebInspector.DOMNode} */(event.data);
         this.update();
     },
 
     /**
      * @override
-     * @param {!WebInspector.Throttler.FinishCallback} finishCallback
      * @protected
+     * @return {!Promise.<?>}
      */
-    doUpdate: function(finishCallback)
+    doUpdate: function()
     {
         if (this._lastRequestedNode) {
             this._lastRequestedNode.target().runtimeAgent().releaseObjectGroup(WebInspector.PropertiesWidget._objectGroupName);
             delete this._lastRequestedNode;
         }
 
         if (!this._node) {
             this.element.removeChildren();
             this.sections = [];
-            finishCallback();
-            return;
+            return Promise.resolve();
         }
 
         this._lastRequestedNode = this._node;
-        this._node.resolveToObjectPromise(WebInspector.PropertiesWidget._objectGroupName)
+        return this._node.resolveToObjectPromise(WebInspector.PropertiesWidget._objectGroupName)
             .then(nodeResolved.bind(this))
-            .then(finishCallback)
-            .catch(/** @type {function()} */(finishCallback));
 
         /**
          * @param {?WebInspector.RemoteObject} object
          * @this {WebInspector.PropertiesWidget}
          */
         function nodeResolved(object)
         {
             if (!object)
                 return;
 
@@ skipping 75 matching lines @@
             return;
         var data = event.data;
         var node = /** @type {!WebInspector.DOMNode} */ (data instanceof WebInspector.DOMNode ? data : data.node);
         if (this._node !== node)
             return;
         this.update();
     },
 
     __proto__: WebInspector.ThrottledWidget.prototype
 }