DevTools: Refactor nits in DebuggerModel event dispatching.

Source/devtools/front_end/promises/PromisePane.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.VBox}
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.PromisePane = function()
@@ skipping 235 matching lines @@
             var t2 = y.creationTime || 0;
             return t1 - t2 || x.id - y.id;
         }
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _onPromiseUpdated: function(event)
     {
-        var target = /** @type {!WebInspector.Target} */ (event.data.target);
+        var target = /** @type {!WebInspector.Target} */ (event.target.target());
         var eventType = /** @type {string} */ (event.data.eventType);
         var details = /** @type {!DebuggerAgent.PromiseDetails} */ (event.data.promise);
         if (eventType === "gc")
             details.__isGarbageCollected = true;
 
         var promiseIdToDetails = this._promiseDetailsByTarget.get(target);
         if (!promiseIdToDetails) {
             promiseIdToDetails = new Map();
             this._promiseDetailsByTarget.set(target, promiseIdToDetails)
         }
@@ skipping 393 matching lines @@
         }
     },
 
     reset: function()
     {
         this._hideCollectedPromisesSetting.set(false);
         this._promiseStatusFiltersSetting.set({});
         this._textFilterUI.setValue("");
     }
 }