whatever it is, wxXmlResource::GetFirstRoot() isn't implemented - removed

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55503 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/xrc/xmlres.h

@@ -108,8 +108,6 @@ public:
     // Destructor.
     virtual ~wxXmlResource();
 
-    wxXmlNode *GetFirstRoot();
-
     // Loads resources from XML files that match given filemask.
     // This method understands VFS (see filesys.h).
     bool Load(const wxString& filemask);