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

third_party/WebKit/Source/devtools/front_end/sources/SourcesNavigator.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 39 matching lines @@
   /**
    * @param {!Common.Event} event
    */
   _inspectedURLChanged(event) {
     var mainTarget = SDK.targetManager.mainTarget();
     if (event.data !== mainTarget)
       return;
     var inspectedURL = mainTarget && mainTarget.inspectedURL();
     if (!inspectedURL)
       return;
-    for (var node of this._uiSourceCodeNodes.valuesArray()) {
+    for (var node of this.uiSourceCodeNodes()) {
       var uiSourceCode = node.uiSourceCode();
       if (uiSourceCode.url() === inspectedURL)
         this.revealUISourceCode(uiSourceCode, true);
     }
   }
 
   /**
    * @override
    * @param {!Workspace.UISourceCode} uiSourceCode
    */
@@ skipping 38 matching lines @@
   /**
    * @param {!Common.Event} event
    */
   _inspectedURLChanged(event) {
     var mainTarget = SDK.targetManager.mainTarget();
     if (event.data !== mainTarget)
       return;
     var inspectedURL = mainTarget && mainTarget.inspectedURL();
     if (!inspectedURL)
       return;
-    for (var node of this._uiSourceCodeNodes.valuesArray()) {
+    for (var node of this.uiSourceCodeNodes()) {
       var uiSourceCode = node.uiSourceCode();
       if (uiSourceCode.url() === inspectedURL)
         this.revealUISourceCode(uiSourceCode, true);
     }
   }
 
   /**
    * @override
    * @param {!Workspace.UISourceCode} uiSourceCode
    */
@@ skipping 140 matching lines @@
     this.create(Snippets.scriptSnippetModel.project(), '');
   }
 
   /**
    * @override
    */
   sourceDeleted(uiSourceCode) {
     this._handleRemoveSnippet(uiSourceCode);
   }
 };