[epiphany] window: Use dzl_application_window_set_titlebar

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 391892d0577a7bd7df694885b4edccabd668bbca
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Aug 27 19:32:05 2017 -0500

    window: Use dzl_application_window_set_titlebar
    
    Necessary for getting the headerbar to show in fullscreen mode... though
    apparently not sufficient either, as it doesn't work.

 src/ephy-window.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/ephy-window.c b/src/ephy-window.c
index 6121fd3..ef794ad 100644
--- a/src/ephy-window.c
+++ b/src/ephy-window.c
@@ -2884,7 +2884,7 @@ setup_header_bar (EphyWindow *window)
   EphyTitleWidget *title_widget;
 
   header_bar = ephy_header_bar_new (window);
-  gtk_window_set_titlebar (GTK_WINDOW (window), header_bar);
+  dzl_application_window_set_titlebar (DZL_APPLICATION_WINDOW (window), header_bar);
   gtk_widget_show (header_bar);
 
   app_mode = ephy_embed_shell_get_mode (ephy_embed_shell_get_default ());