[MD] Don't use new OTR native-theming when using a custom browser theme.

chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc

Index: chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc
diff --git a/chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc b/chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc
index d38e649e16036e08c6ce55d47ec4724491fc5da3..58948c10f2af8e36cfa80052c176931515073c0b 100644
--- a/chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc
+++ b/chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc
@@ -252,7 +252,6 @@ void OmniboxPopupContentsView::UpdatePopupAppearance() {
     params.parent = popup_parent->GetNativeView();
     params.bounds = GetPopupBounds();
     params.context = popup_parent->GetNativeWindow();
-    params.native_theme = popup_parent->GetNativeTheme();
     popup_->Init(params);
     // Third-party software such as DigitalPersona identity verification can
     // hook the underlying window creation methods and use SendMessage to