move SendSizeEvent() down to wxWindow from wxFrame; added SendSizeEventToParent() helper

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54803 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/motif/frame.h

@@ -87,10 +87,9 @@ public:
 
     bool PreResize();
 
-    void SendSizeEvent();
-
     // for generic/mdig.h
     virtual void DoGetClientSize(int *width, int *height) const;
+
 private:
     // common part of all ctors
     void Init();