[DevTools] Hide empty toolbars

third_party/WebKit/Source/devtools/front_end/resources/ResourcesPanel.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 621 matching lines @@
     if (this.visibleView === view)
       return;
 
     if (this.visibleView)
       this.visibleView.detach();
 
     view.show(this.storageViews);
     this.visibleView = view;
 
     this._storageViewToolbar.removeToolbarItems();
-    var toolbarItems = view instanceof UI.SimpleView ? view.syncToolbarItems() : null;
-    for (var i = 0; toolbarItems && i < toolbarItems.length; ++i)
+    var toolbarItems = (view instanceof UI.SimpleView && view.syncToolbarItems()) || [];
+    for (var i = 0; i < toolbarItems.length; ++i)
       this._storageViewToolbar.appendToolbarItem(toolbarItems[i]);
+    this._storageViewToolbar.setVisible(toolbarItems.length > 0);
   }
 
   closeVisibleView() {
     if (!this.visibleView)
       return;
     this.visibleView.detach();
     delete this.visibleView;
   }
 
   _updateDatabaseTables(event) {
@@ skipping 1406 matching lines @@
 
     this.element.classList.add('storage-view');
     this._emptyWidget = new UI.EmptyWidget('');
     this._emptyWidget.show(this.element);
   }
 
   setText(text) {
     this._emptyWidget.text = text;
   }
 };