Re-enable PRESUBMIT check for empty unique_ptr<> rvalue

ui/views/examples/examples_main.cc

Index: ui/views/examples/examples_main.cc
diff --git a/ui/views/examples/examples_main.cc b/ui/views/examples/examples_main.cc
index bc930998cb7ab358805d493de00dac4fcb3ffd6e..98f73c0c3b8e44058e3e16071a7bae8fc7332bd0 100644
--- a/ui/views/examples/examples_main.cc
+++ b/ui/views/examples/examples_main.cc
@@ -112,9 +112,8 @@ int main(int argc, char** argv) {
     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();