[DevTools] Make resource tree model optional

third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js

 /*
  * Copyright (C) 2007, 2008 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 169 matching lines @@
     },
 
     _consoleHistoryAutocompleteChanged: function()
     {
         this._prompt.setAddCompletionsFromHistory(this._consoleHistoryAutocompleteSetting.get());
     },
 
     _initConsoleMessages: function()
     {
         var mainTarget = WebInspector.targetManager.mainTarget();
-        if (!mainTarget || !mainTarget.resourceTreeModel.cachedResourcesLoaded()) {
+        var resourceTreeModel = mainTarget && WebInspector.ResourceTreeModel.fromTarget(mainTarget);
+        if (!resourceTreeModel || !resourceTreeModel.cachedResourcesLoaded()) {
             WebInspector.targetManager.addModelListener(WebInspector.ResourceTreeModel, WebInspector.ResourceTreeModel.EventTypes.CachedResourcesLoaded, this._onResourceTreeModelLoaded, this);
             return;
         }
         this._fetchMultitargetMessages();
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _onResourceTreeModelLoaded: function(event)
@@ skipping 1211 matching lines @@
             return true;
         }
         return false;
     }
 }
 
 /**
 * @typedef {{messageIndex: number, matchIndex: number}}
 */
 WebInspector.ConsoleView.RegexMatchRange;