./cut-n-paste/toolbar-editor/egg-editable-toolbar.c:  action = g_object_get_data (G_OBJECT (widget), "gtk-action");
./cut-n-paste/toolbar-editor/egg-editable-toolbar.c:      action = g_object_get_data (G_OBJECT (widget), "gtk-action");
./cut-n-paste/toolbar-editor/egg-editable-toolbar.c:					 "gtk-action");

This is fixed in libegg, so you just need to reimport from libegg.

+++ This bug was initially created as a clone of Bug #568886 +++

From epiphany bug 568848:

While testing some GtkAction changes in GTK+ trunk, I've found that epiphany
uses
g_object_get_data (widget, "gtk-action") to get at the action associated with a
widget in some places. 

Please don't do that. We consider that undocumented object data an
implementation detail, and it will go away at some point. Instead, use the
documented api  for this: gtk_widget_get_action.

This bugs tracks this problem in the affected modules.