Enable the Security panel by default.

third_party/WebKit/Source/devtools/front_end/main/Main.js

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 149 matching lines @@
                 Runtime.experiments.enableForTest("layersPanel");
             if (testPath.indexOf("service-workers/") !== -1)
                 Runtime.experiments.enableForTest("serviceWorkersInResources");
             if (testPath.indexOf("timeline/") !== -1 || testPath.indexOf("layers/") !== -1)
                 Runtime.experiments.enableForTest("layersPanel");
             if (testPath.indexOf("security/") !== -1)
                 Runtime.experiments.enableForTest("securityPanel");
         }
 
         Runtime.experiments.setDefaultExperiments([
+            "securityPanel"
         ]);
     },
 
     /**
      * @suppressGlobalPropertiesCheck
      */
     _createAppUI: function()
     {
         console.timeStamp("Main._createApp");
 
@@ skipping 789 matching lines @@
     p.classList.add("help-section");
     p.textContent = WebInspector.UIString("Inspected worker has terminated. Once it restarts we will attach to it automatically.");
 }
 
 WebInspector.WorkerTerminatedScreen.prototype = {
 
     __proto__: WebInspector.HelpScreen.prototype
 }
 
 new WebInspector.Main();