[DevTools] Hide empty toolbars

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

Index: third_party/WebKit/Source/devtools/front_end/resources/ResourcesPanel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/resources/ResourcesPanel.js b/third_party/WebKit/Source/devtools/front_end/resources/ResourcesPanel.js
index 58a3e642cdab996bb9782eb1741aa93a34e3d2c1..f2efc635a2a5654bfe6dab05715a5f9a3ce2cf5f 100644
--- a/third_party/WebKit/Source/devtools/front_end/resources/ResourcesPanel.js
+++ b/third_party/WebKit/Source/devtools/front_end/resources/ResourcesPanel.js
@@ -639,9 +639,10 @@ Resources.ResourcesPanel = class extends UI.PanelWithSidebar {
     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.element.classList.toggle('hidden', !toolbarItems.length);
   }
 
   closeVisibleView() {