DevTools: Do not focus navigator on sources panel by default.

Source/devtools/front_end/sources/SourcesPanel.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 168 matching lines @@
     {
         var target = /** @type {?WebInspector.Target} */ (event.data);
         this._setTarget(target);
     },
 
     /**
      * @return {!Element}
      */
     defaultFocusedElement: function()
     {
-        return this._sourcesView.defaultFocusedElement() || this._navigator.view.defaultFocusedElement();
+        return this._sourcesView.defaultFocusedElement();
     },
 
     /**
      * @return {boolean}
      */
     paused: function()
     {
         return this._paused;
     },
 
@@ skipping 1250 matching lines @@
      */
     handleAction: function()
     {
         var panel = /** @type {?WebInspector.SourcesPanel} */ (WebInspector.inspectorView.showPanel("sources"));
         if (!panel)
             return false;
         panel.togglePause();
         return true;
     }
 }