[glibmm/glibmm-2-50] Revert "ustring: Add cbegin() and cend()."

[Murray Cumming <murrayc src gnome org>]

commit f4c232fe4bbf28e4ec66b34d0ff8c7a49df2df80
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Apr 4 18:54:33 2017 +0200

    Revert "ustring: Add cbegin() and cend()."
    
    This reverts commit 1cce397af6d1c9dd588d4a16e2b33933bb30d2ea.
    
    We should not add API in a stable release cycle.

 glib/glibmm/ustring.cc |   12 ------------
 glib/glibmm/ustring.h  |   10 ----------
 2 files changed, 0 insertions(+), 22 deletions(-)
---
diff --git a/glib/glibmm/ustring.cc b/glib/glibmm/ustring.cc
index eae9802..15ab009 100644
--- a/glib/glibmm/ustring.cc
+++ b/glib/glibmm/ustring.cc
@@ -841,18 +841,6 @@ ustring::rend() const
   return const_reverse_iterator(const_iterator(string_.begin()));
 }
 
-ustring::const_iterator
-ustring::cbegin() const
-{
-  return const_iterator(string_.begin());
-}
-
-ustring::const_iterator
-ustring::cend() const
-{
-  return const_iterator(string_.end());
-}
-
 /**** Glib::ustring::find() ************************************************/
 
 ustring::size_type
diff --git a/glib/glibmm/ustring.h b/glib/glibmm/ustring.h
index fe45c1a..8e8a546 100644
--- a/glib/glibmm/ustring.h
+++ b/glib/glibmm/ustring.h
@@ -469,16 +469,6 @@ public:
   const_reverse_iterator rbegin() const;
   const_reverse_iterator rend() const;
 
-  /**
-   * @newin{2,52}
-   */
-  const_iterator cbegin() const;
-
-  /**
-   * @newin{2,52}
-   */
-  const_iterator cend() const;
-
   //! @}
   //! @name Find sub-strings.
   //! @{