Merge revision 1038 changes:

- Linux: Emit "delete_event" signal instead of calling gtk_widget_destroy (issue #780).

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1364@1040 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

cef3/libcef/browser/browser_host_impl_gtk.cc

@@ -260,7 +260,7 @@ void CefBrowserHostImpl::PlatformCloseWindow() {
   if (window_info_.widget != NULL) {
     GtkWidget* window =
         gtk_widget_get_toplevel(GTK_WIDGET(window_info_.widget));
-    gtk_widget_destroy(window);
+    gtk_signal_emit_by_name(GTK_OBJECT(window), "delete_event");
   }
 }