[gedit-plugins] Remove forgotten uses of old menu API

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 011c871e689bed9e36daf66696d31ec2578688af
Author: Sergej Chodarev <sergejx centrum sk>
Date:   Mon Apr 14 19:52:24 2014 +0200

    Remove forgotten uses of old menu API
    
    http://bugzilla.gnome.org/show_bug.cgi?id=728201

 plugins/synctex/synctex/synctex.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/plugins/synctex/synctex/synctex.py b/plugins/synctex/synctex/synctex.py
index bb7852f..01ee703 100644
--- a/plugins/synctex/synctex/synctex.py
+++ b/plugins/synctex/synctex/synctex.py
@@ -204,7 +204,7 @@ class SynctexViewHelper:
 
             style = self._doc.get_style_scheme().get_style('search-match')
             apply_style(style, self._highlight_tag)
-            self._plugin._action_group.set_sensitive(True)
+            self._window.lookup_action("synctex").set_enabled(True)
             self.window_proxy = self._plugin.ref_evince_proxy(self.out_gfile, self._window)
 
         elif not self.active and self.window_proxy is not None:
@@ -214,7 +214,7 @@ class SynctexViewHelper:
             for handler in self._view_active_handlers:
                 self._view.disconnect(handler)
 
-            self._plugin._action_group.set_sensitive(False)
+            self._window.lookup_action("synctex").set_enabled(False)
             self._plugin.unref_evince_proxy(self.out_gfile)
             self.window_proxy = None