make access for virtuals match base

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50547 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dc.h

@@ -36,12 +36,10 @@ public:
 
     virtual GdkWindow* GetGDKWindow() const { return NULL; }
 
-protected:
     // base class pure virtuals implemented here
     virtual void DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
     virtual void DoGetSizeMM(int* width, int* height) const;
 
-private:
     DECLARE_ABSTRACT_CLASS(wxGTKDCImpl)
 };