8226951: Backout commit for JDK-8226537 to fix the attribution
Reviewed-by:

diff --git a/modules/javafx.graphics/src/main/native-glass/gtk/glass_window.cpp b/modules/javafx.graphics/src/main/native-glass/gtk/glass_window.cpp
--- a/modules/javafx.graphics/src/main/native-glass/gtk/glass_window.cpp
+++ b/modules/javafx.graphics/src/main/native-glass/gtk/glass_window.cpp
@@ -199,11 +199,6 @@
 
     std::set<WindowContextTop*>::iterator it;
     for (it = children.begin(); it != children.end(); ++it) {
-        // FIX JDK-8226537: this method calls set_owner(NULL) which prevents
-        // WindowContextTop::process_destroy() to call remove_child() (because children
-        // is being iterated here) but also prevents gtk_window_set_transient_for from
-        // being called - this causes the crash on gnome.
-        gtk_window_set_transient_for((*it)->get_gtk_window(), NULL);
         (*it)->set_owner(NULL);
         destroy_and_delete_ctx(*it);
     }