Re-enable PRESUBMIT check for empty unique_ptr<> rvalue

ui/views/examples/examples_main.cc

 // Copyright 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 <memory>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/i18n/icu_util.h"
@@ skipping 94 matching lines @@
     views::DesktopTestViewsDelegate views_delegate;
 #if defined(USE_AURA)
     wm::WMState wm_state;
 #endif
 #if !defined(OS_CHROMEOS) && defined(USE_AURA)
     std::unique_ptr<display::Screen> desktop_screen(
         views::CreateDesktopScreen());
     display::Screen::SetScreenInstance(desktop_screen.get());
 #endif
 
-    views::examples::ShowExamplesWindow(
-        views::examples::QUIT_ON_CLOSE, nullptr,
-        std::unique_ptr<ScopedVector<views::examples::ExampleBase>>());
+    views::examples::ShowExamplesWindow(views::examples::QUIT_ON_CLOSE, nullptr,
+                                        nullptr);
 
     base::RunLoop().Run();
 
     ui::ResourceBundle::CleanupSharedInstance();
   }
 
   ui::ShutdownInputMethod();
 
 #if defined(USE_AURA)
   env.reset();
 #endif
 
   return 0;
 }