Also remove useless wxDataViewCtrl::OnMouse() from Mac version

This empty event handler doesn't do anything useful.

include/wx/osx/dataview.h

@@ -284,7 +284,6 @@ protected:
 
  // event handling
   void OnSize(wxSizeEvent &event);
-  void OnMouse(wxMouseEvent &event);
 
 private:
  // initializing of local variables:

src/osx/dataview_osx.cpp

@@ -765,16 +765,10 @@ wxSize wxDataViewCtrl::DoGetBestSize() const
     return best;
 }
 
-void wxDataViewCtrl::OnMouse(wxMouseEvent& event)
-{
-    event.Skip();
-}
-
 wxIMPLEMENT_DYNAMIC_CLASS(wxDataViewCtrl,wxDataViewCtrlBase);
 
 wxBEGIN_EVENT_TABLE(wxDataViewCtrl,wxDataViewCtrlBase)
   EVT_SIZE(wxDataViewCtrl::OnSize)
-  EVT_MOTION(wxDataViewCtrl::OnMouse)
 wxEND_EVENT_TABLE()
 
 #endif // !wxHAS_GENERIC_DATAVIEWCTRL