[DevTools] Remove Common.Event.target field.

third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js

 /*
  * Copyright (C) 2011 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 88 matching lines @@
 
   _processCachedResources(error, mainFramePayload) {
     if (!error) {
       this.dispatchEventToListeners(SDK.ResourceTreeModel.Events.WillLoadCachedResources);
       this._addFramesRecursively(null, mainFramePayload);
       this.target().setInspectedURL(mainFramePayload.frame.url);
     }
     this._cachedResourcesProcessed = true;
     this.target().runtimeModel.setExecutionContextComparator(this._executionContextComparator.bind(this));
     this.target().runtimeModel.fireExecutionContextOrderChanged();
-    this.dispatchEventToListeners(SDK.ResourceTreeModel.Events.CachedResourcesLoaded);
+    this.dispatchEventToListeners(SDK.ResourceTreeModel.Events.CachedResourcesLoaded, this);
   }
 
   /**
    * @return {boolean}
    */
   cachedResourcesLoaded() {
     return this._cachedResourcesProcessed;
   }
 
   /**
@@ skipping 773 matching lines @@
     this._resourceTreeModel.dispatchEventToListeners(SDK.ResourceTreeModel.Events.InterstitialHidden);
   }
 
   /**
    * @override
    */
   navigationRequested() {
     // Frontend is not interested in when navigations are requested.
   }
 };