Use gfx::NativeView rather than gfx::NativeWindow to identify web contents modal dialogs

chrome/browser/ui/gtk/constrained_window_gtk.cc

Index: chrome/browser/ui/gtk/constrained_window_gtk.cc
diff --git a/chrome/browser/ui/gtk/constrained_window_gtk.cc b/chrome/browser/ui/gtk/constrained_window_gtk.cc
index a280ffe30543f9f920de9714599ef3500efe5752..daba5e0e831d8336e91a561cc1827352217c6433 100644
--- a/chrome/browser/ui/gtk/constrained_window_gtk.cc
+++ b/chrome/browser/ui/gtk/constrained_window_gtk.cc
@@ -119,8 +119,8 @@ void ConstrainedWindowGtk::FocusWebContentsModalDialog() {
 void ConstrainedWindowGtk::PulseWebContentsModalDialog() {
 }
 
-gfx::NativeWindow ConstrainedWindowGtk::GetNativeWindow() {
-  return GTK_WINDOW(gtk_widget_get_toplevel(widget()));
+gfx::NativeView ConstrainedWindowGtk::GetNativeView() {
+  return widget();
 }
 
 void ConstrainedWindowGtk::BackgroundColorChanged() {