[epiphany/gnome-3-32] web-view: remove the previous extension weak pointer before setting a new one

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b0e53053ca6ff7745bc6c723306f5a21d99cf0f9
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 59c58fd5b..d6b10700f 100644
--- a/embed/ephy-web-view.c
+++ b/embed/ephy-web-view.c
@@ -909,6 +909,9 @@ page_created_cb (EphyEmbedShell        *shell,
   if (webkit_web_view_get_page_id (WEBKIT_WEB_VIEW (view)) != page_id)
     return;
 
+  if (view->web_extension)
+    g_object_remove_weak_pointer (G_OBJECT (view->web_extension), (gpointer *)&view->web_extension);
+
   view->web_extension = web_extension;
   g_object_add_weak_pointer (G_OBJECT (view->web_extension), (gpointer *)&view->web_extension);