fix: `win.center()` on Windows (#42197)

fix: win.center() on Windows

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

shell/browser/native_window_views.cc

@@ -1085,7 +1085,7 @@ void NativeWindowViews::Center() {
 #else
   HWND hwnd = GetAcceleratedWidget();
   gfx::Size size = display::win::ScreenWin::DIPToScreenSize(hwnd, GetSize());
-  gfx::CenterAndSizeWindow(hwnd, hwnd, size);
+  gfx::CenterAndSizeWindow(nullptr, hwnd, size);
 #endif
 }