[epiphany/carlosgc/extension-weak-pointer] web-view: remove the previous extension weak pointer before setting a new one

[Carlos Garcia Campos <carlosgc src gnome org>]

commit c201ca3ba935f5df630f53f115693391f059252c
Author: Carlos Garcia Campos <cgarcia igalia com>
Date:   Tue Sep 3 14:56:53 2019 +0200

    web-view: remove the previous extension weak pointer before setting a new one
    
    Now that WebKit has PSON enabled, it's possible to have different web
    processes for the same web view ID. When the view swaps processes, the
    page created signal is emitted in the new process, and a new web
    extension proxy is set.
    
    This might fix https://gitlab.gnome.org/GNOME/epiphany/issues/871

 embed/ephy-web-view.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/embed/ephy-web-view.c b/embed/ephy-web-view.c
index 6b8bfc8f5..5ab387d4f 100644
--- a/embed/ephy-web-view.c
+++ b/embed/ephy-web-view.c
@@ -914,6 +914,9 @@ page_created_cb (EphyEmbedShell               *shell,
   if (webkit_web_view_get_page_id (WEBKIT_WEB_VIEW (view)) != page_id)
     return;
 
+  if (view->web_process_extension)
+    g_object_remove_weak_pointer (G_OBJECT (view->web_process_extension), (gpointer 
*)&view->web_process_extension);
+
   view->web_process_extension = web_process_extension;
   g_object_add_weak_pointer (G_OBJECT (view->web_process_extension), (gpointer 
*)&view->web_process_extension);