DevTools: Fix focus handling in debug mode.

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 109 matching lines @@
                 else if (extensions[i].descriptor()["location"] === "toolbar-right")
                     WebInspector.inspectorView.appendToRightToolbar(item);
             }
         }
     },
 
     _loaded: function()
     {
         console.timeStamp("Main._loaded");
 
+        WebInspector.initializeUIUtils();
         this._createSettings();
         this._createAppUI();
     },
 
     _createSettings: function()
     {
         WebInspector.settings = new WebInspector.Settings();
         this._initializeExperiments();
 
         // This setting is needed for backwards compatibility with Devtools CodeSchool extension. DO NOT REMOVE
@@ skipping 726 matching lines @@
     /**
      * @param {!WebInspector.Event} event
      */
     _inspectNode: function(event)
     {
         WebInspector.Revealer.reveal(/** @type {!WebInspector.DOMNode} */ (event.data));
     }
 }
 
 new WebInspector.Main();