[DevTools] Pass sidebar and not the panel.

third_party/WebKit/Source/devtools/front_end/resources/ApplicationPanelSidebar.js

 /*
  * Copyright (C) 2007, 2008, 2010 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  * Copyright (C) 2013 Samsung Electronics. 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
@@ skipping 593 matching lines @@
  * @unrestricted
  */
 Resources.BaseStorageTreeElement = class extends UI.TreeElement {
   /**
    * @param {!Resources.ResourcesPanel} storagePanel
    * @param {string} title
    * @param {boolean} expandable
    */
   constructor(storagePanel, title, expandable) {
     super(title, expandable);
+    console.assert(storagePanel);

[dgozman, 2017/04/04 16:48:30]

It is marked as non-nullable. Don't assert.

[eostroukhov, 2017/04/04 17:31:37]

Done.

     this._storagePanel = storagePanel;
   }
 
   /**
    * @override
    * @return {boolean}
    */
   onselect(selectedByUser) {
     if (!selectedByUser)
       return false;
@@ skipping 105 matching lines @@
   _updateChildren() {
     this.removeChildren();
 
     /**
      * @param {!Array.<string>} tableNames
      * @this {Resources.DatabaseTreeElement}
      */
     function tableNamesCallback(tableNames) {
       var tableNamesLength = tableNames.length;
       for (var i = 0; i < tableNamesLength; ++i)
-        this.appendChild(new Resources.DatabaseTableTreeElement(this._storagePanel, this._database, tableNames[i]));
+        this.appendChild(new Resources.DatabaseTableTreeElement(this._sidebar, this._database, tableNames[i]));
     }
     this._database.getTableNames(tableNamesCallback.bind(this));
   }
 };
 
 /**
  * @unrestricted
  */
 Resources.DatabaseTableTreeElement = class extends Resources.BaseStorageTreeElement {
+  /**
+   * @param {!Resources.ApplicationPanelSidebar} sidebar
+   * @param {!Resources.Database} database
+   * @param {string} tableName
+   */
   constructor(sidebar, database, tableName) {
     super(sidebar._panel, tableName, false);
     this._sidebar = sidebar;
     this._database = database;
     this._tableName = tableName;
     var icon = UI.Icon.create('mediumicon-table', 'resource-tree-item');
     this.setLeadingIcons([icon]);
   }
 
   get itemURL() {
@@ skipping 883 matching lines @@
 
     this.element.classList.add('storage-view');
     this._emptyWidget = new UI.EmptyWidget('');
     this._emptyWidget.show(this.element);
   }
 
   setText(text) {
     this._emptyWidget.text = text;
   }
 };