DevTools: Fix JSDoc and code landed in r169951.

Source/devtools/front_end/PowerProfiler.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.Object}
  */
 WebInspector.PowerProfiler = function()
 {
@@ skipping 15 matching lines @@
     stopProfile: function ()
     {
         PowerAgent.end();
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @constructor
- * @implements {WebInspector.PowerEventDispatcher}
+ * @implements {PowerAgent.Dispatcher}
  */
 WebInspector.PowerDispatcher = function(profiler)
 {
     this._profiler = profiler;
     InspectorBackend.registerPowerDispatcher(this);
 }
 
 WebInspector.PowerDispatcher.prototype = {
     dataAvailable: function(events)
     {
-        for (var i in events)
+        for (var i = 0; i < events.length; ++i)
             this._profiler.dispatchEventToListeners(WebInspector.PowerProfiler.EventTypes.PowerEventRecorded, events[i]);
     }
 }
 
 /**
  * @type {!WebInspector.PowerProfiler}
  */
 WebInspector.powerProfiler;