DevTools: remove WI.SourcesView._currentUISourceCode

third_party/WebKit/Source/devtools/front_end/sources/TabbedEditorContainer.js

 /*
  * 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.
  *
@@ skipping 497 matching lines @@
 
     /**
      * @return {string}
      */
     _generateTabId: function()
     {
         return "tab_" + (WebInspector.TabbedEditorContainer._tabId++);
     },
 
     /**
-     * @return {!WebInspector.UISourceCode} uiSourceCode
+     * @return {?WebInspector.UISourceCode} uiSourceCode
      */
     currentFile: function()
     {
-        return this._currentFile;
+        return this._currentFile || null;
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @constructor
  * @param {string} url
  * @param {!WebInspector.TextRange=} selectionRange
  * @param {number=} scrollLineNumber
@@ skipping 213 matching lines @@
     /**
      * @override
      * @param {string} tabId
      * @param {!WebInspector.ContextMenu} contextMenu
      */
     onContextMenu: function(tabId, contextMenu)
     {
         this._editorContainer._onContextMenu(tabId, contextMenu);
     }
 }