Lots of OS/2 Updates mirroring msw updates

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10377 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/frame.cpp

@@ -1109,15 +1109,6 @@ void wxFrame::OnActivate(
     }
 } // end of wxFrame::OnActivate
 
-void wxFrame::RemoveChild(
-  wxWindowBase*                     pChild
-)
-{
-    if (pChild == m_pWinLastFocused)
-        m_pWinLastFocused = NULL;
-    wxFrameBase::RemoveChild(pChild);
-} // end of wxFrame::RemoveChild
-
 // ----------------------------------------------------------------------------
 // wxFrame size management: we exclude the areas taken by menu/status/toolbars
 // from the client area, so the client area is what's really available for the