[epiphany/mcatanzaro/#1004-gnome-3-34] filters-manager: fix crash in dispose

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 8a1b7e6a28db991887b5b67f27a93e576b06ff18
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Tue Nov 26 18:50:23 2019 -0600

    filters-manager: fix crash in dispose
    
    WebKitUserContentFilter is not a GObject.
    
    Fixes #1004

 embed/ephy-filters-manager.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/embed/ephy-filters-manager.c b/embed/ephy-filters-manager.c
index 02d6daf0b..c631d6b87 100644
--- a/embed/ephy-filters-manager.c
+++ b/embed/ephy-filters-manager.c
@@ -915,7 +915,7 @@ ephy_filters_manager_dispose (GObject *object)
     g_cancellable_cancel (manager->cancellable);
     g_clear_object (&manager->cancellable);
   }
-  g_clear_object (&manager->wk_filter);
+  g_clear_pointer (&manager->wk_filter, webkit_user_content_filter_unref);
   g_clear_object (&manager->store);
 
   G_OBJECT_CLASS (ephy_filters_manager_parent_class)->dispose (object);