Remove redundant wxAuiNotebook methods already present in wxBookCtrlBase.

wxAuiNotebook already inherits perfectly workable AdvanceSelection() and
GetCurrentPage() methods from wxBookCtrlBase, no need to reimplement them in
it.

See #14309.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71560 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/aui/auibook.h

@@ -327,9 +327,6 @@ public:
     // Gets the height of the notebook for a given page height
     int GetHeightForPageHeight(int pageHeight);
 
-    // Advances the selection, generation page selection events
-    void AdvanceSelection(bool forward = true);
-
     // Shows the window menu
     bool ShowWindowMenu();
 
@@ -347,8 +344,6 @@ public:
     virtual int GetPageImage(size_t n) const;
     virtual bool SetPageImage(size_t n, int imageId);
 
-    wxWindow* GetCurrentPage () const;
-
     virtual int ChangeSelection(size_t n);
 
     virtual bool AddPage(wxWindow *page, const wxString &text, bool select,