DevTools: Clean up the Event Listeners pane data representation

Source/devtools/front_end/sdk/DOMModel.js

 /*
  * Copyright (C) 2009, 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * 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.
@@ skipping 2075 matching lines @@
 /**
  * @constructor
  * @extends {WebInspector.SDKObject}
  * @param {!WebInspector.Target} target
  * @param {!DOMAgent.EventListener} payload
  */
 WebInspector.DOMModel.EventListener = function(target, payload)
 {
     WebInspector.SDKObject.call(this, target);
     this._payload = payload;
-    var sourceName = this._payload.sourceName;
-    if (!sourceName) {
-        var script = target.debuggerModel.scriptForId(payload.location.scriptId);
-        sourceName = script ? script.contentURL() : "";
-    }
+    var script = target.debuggerModel.scriptForId(payload.location.scriptId);
+    var sourceName = script ? script.contentURL() : "";
     this._sourceName = sourceName;
 }
 
 WebInspector.DOMModel.EventListener.prototype = {
     /**
      * @return {!DOMAgent.EventListener}
      */
     payload: function()
     {
         return this._payload;
@@ skipping 102 matching lines @@
 
     /**
      * @override
      * @param {!PageAgent.FrameId} frameId
      */
     highlightFrame: function(frameId)
     {
         this._agent.highlightFrame(frameId, WebInspector.Color.PageHighlight.Content.toProtocolRGBA(), WebInspector.Color.PageHighlight.ContentOutline.toProtocolRGBA());
     }
 }