[epiphany] ephy-title-box: Fix crash when closing second window

[Carlos Garcia Campos <carlosgc src gnome org>]

commit b7c278ec8d7743c43ad8e8e9a9cf6a6a51d9534a
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon Jul 21 10:31:42 2014 -0500

    ephy-title-box: Fix crash when closing second window
    
    The web view can be destroyed out from under us, so we need to use a
    weak reference to determine if it is still alive.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=732784

 src/ephy-title-box.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/ephy-title-box.c b/src/ephy-title-box.c
index 3ccf65e..e682f3a 100644
--- a/src/ephy-title-box.c
+++ b/src/ephy-title-box.c
@@ -551,15 +551,15 @@ ephy_title_box_set_web_view (EphyTitleBox  *title_box,
     g_clear_object (&priv->title_binding);
     g_clear_object (&priv->uri_binding);
 
-    g_object_unref (priv->web_view);
+    g_object_remove_weak_pointer (G_OBJECT (priv->web_view), (gpointer *)&priv->web_view);
   }
 
-  priv->web_view = NULL;
+  priv->web_view = web_view;
 
   if (web_view == NULL)
     return;
 
-  priv->web_view = g_object_ref (web_view);
+  g_object_add_weak_pointer (G_OBJECT (web_view), (gpointer *)&priv->web_view);
 
   title = webkit_web_view_get_title (web_view);