After uninstall, remove last item in Launcher folder

chrome/browser/ui/app_list/extension_app_model_builder.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/app_list/extension_app_model_builder.h"
 
 #include <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 187 matching lines @@
   item->UpdateIcon();
 }
 
 void ExtensionAppModelBuilder::OnExtensionUninstalled(
     content::BrowserContext* browser_context,
     const extensions::Extension* extension,
     extensions::UninstallReason reason) {
   if (service_) {
     DVLOG(2) << service_ << ": OnExtensionUninstalled: "
              << extension->id().substr(0, 8);
-    service_->RemoveItem(extension->id());
+    service_->RemoveUninstalledItem(extension->id());
     return;
   }
-  model_->DeleteItem(extension->id());
+  model_->DeleteUninstalledItem(extension->id());
 }
 
 void ExtensionAppModelBuilder::OnDisabledExtensionUpdated(
     const Extension* extension) {
   if (!extensions::ui_util::ShouldDisplayInAppLauncher(extension, profile_))
     return;
 
   ExtensionAppItem* existing_item = GetExtensionAppItem(extension->id());
   if (existing_item)
     existing_item->Reload();
@@ skipping 103 matching lines @@
     app_list::AppListItem* item = item_list->item_at(idx + 1);
     if (item->GetItemType() == ExtensionAppItem::kItemType) {
       next = static_cast<ExtensionAppItem*>(item);
       break;
     }
   }
   // item->Move will call set_position, overriding the item's position.
   if (prev || next)
     static_cast<ExtensionAppItem*>(item)->Move(prev, next);
 }