move the logic for changing notebook pages using the standard Ctrl-Tab/PageUp/Dn keys even when focus is outside of the notebook to wxControlContainer from wxTopLevelWindowMSW to allow it work for notebooks whose parent is not a TLW (as a side effect, this now also works in all ports although I don't really know how desirable this is)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40552 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/toplevel.h

@@ -103,9 +103,6 @@ public:
     // choose the right parent to use with CreateWindow()
     virtual WXHWND MSWGetParent() const;
 
-    // return true if the message was preprocessed and shouldn't be dispatched
-    virtual bool MSWProcessMessage(WXMSG* pMsg);
-
     // window proc for the frames
     WXLRESULT MSWWindowProc(WXUINT message, WXWPARAM wParam, WXLPARAM lParam);