Converted wxGTK's basic DC classes to new DC code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48910 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/bitmap.h

@@ -137,6 +137,8 @@ private:
     bool CreateFromImageAsPixbuf(const wxImage& image);
 #endif // wxUSE_IMAGE
 
+public:
+    // implementation only
     enum Representation
     {
         Pixmap,
@@ -146,9 +148,6 @@ private:
     // (wxBitmap may keep same bitmap e.g. as both pixmap and pixbuf):
     void PurgeOtherRepresentations(Representation keep);
 
-    friend class wxMemoryDC;
-    friend class wxBitmapHandler;
-
 private:
     DECLARE_DYNAMIC_CLASS(wxBitmap)
 };