DevTools: fix private field usage violation discovered after the compiler roll.

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

 /*
  * Copyright (C) 2012 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 272 matching lines @@
     this.uiSourceCodeAdded(uiSourceCode);
   }
 
   /**
    * @param {!Workspace.UISourceCode} uiSourceCode
    */
   uiSourceCodeAdded(uiSourceCode) {
   }
 
   /**
+   * @return {!Array<!Sources.NavigatorUISourceCodeTreeNode>}
+   */
+  uiSourceCodeNodes() {
+    return this._uiSourceCodeNodes.valuesArray();
+  }
+
+  /**
    * @param {!Common.Event} event
    */
   _uiSourceCodeAdded(event) {
     var uiSourceCode = /** @type {!Workspace.UISourceCode} */ (event.data);
     this._addUISourceCode(uiSourceCode);
   }
 
   /**
    * @param {!Common.Event} event
    */
@@ skipping 1291 matching lines @@
   /**
    * @param {string} title
    * @override
    */
   setTitle(title) {
     this._title = title;
     if (this._treeElement)
       this._treeElement.title = this._title;
   }
 };