[glibmm] Gio::MenuModel::get_item_atribute(): const correction.

[Murray Cumming <murrayc src gnome org>]

commit 02a06c002a9c92b0220145c7c3d6bcd2adb2f64c
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Dec 2 12:06:06 2016 +0100

    Gio::MenuModel::get_item_atribute(): const correction.
    
    We can fix this now that we can break ABI.

 gio/src/menumodel.hg |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/gio/src/menumodel.hg b/gio/src/menumodel.hg
index 696e8f5..bf29a12 100644
--- a/gio/src/menumodel.hg
+++ b/gio/src/menumodel.hg
@@ -132,16 +132,13 @@ public:
 #m4begin
 dnl See the .ccg implementation for how this conversion works.
 
-  //TODO: When we can break ABI, remove the method overload and just make it const.
-  //It makes no sense to return const by value.
   _CONVERSION(`MenuAttribute',`const gchar*',`giomm_get_menu_attribute($3)')
 #m4end
 
   //TODO: Add a get_item_attribute() templated method to get values directly
   //instead of returning a Glib::VariantBase?
 
-  _WRAP_METHOD(Glib::VariantBase get_item_attribute(int item_index, MenuAttribute attribute, const 
Glib::VariantType& expected_type), g_menu_model_get_item_attribute_value)
-  _WRAP_METHOD(const Glib::VariantBase get_item_attribute(int item_index, MenuAttribute attribute, const 
Glib::VariantType& expected_type) const, g_menu_model_get_item_attribute_value, constversion)
+  _WRAP_METHOD(Glib::VariantBase get_item_attribute(int item_index, MenuAttribute attribute, const 
Glib::VariantType& expected_type) const, g_menu_model_get_item_attribute_value)
 
   // Ignore varargs function
   _IGNORE(g_menu_model_get_item_attribute)