Qt4: remove dead declaration

modules/gui/qt4/main_interface.hpp

@@ -73,7 +73,6 @@ public:
     void *requestVideo( vout_thread_t *p_nvout, int *pi_x,
                         int *pi_y, unsigned int *pi_width,
                         unsigned int *pi_height );
-    void requestNotEmbeddedVideo( vout_thread_t *p_nvout );
     void releaseVideo( void * );
     int controlVideo( void *p_window, int i_query, va_list args );
     void requestLayoutUpdate();