Plane: Remove update_navigation() method.

ArduPlane/ArduPlane.cpp

@@ -434,14 +434,6 @@ void Plane::update_control_mode(void)
     effective_mode->update();
 }
 
-/* 
-  call the navigate method of the active flight mode
-*/
-void Plane::update_navigation()
-{
-    control_mode->navigate();
-}
-
 /*
   set the flight stage
  */

ArduPlane/Plane.h

@@ -969,7 +969,6 @@ private:
     void update_logging2(void);
     void update_control_mode(void);
     void update_flight_stage();
-    void update_navigation();
     void set_flight_stage(AP_Vehicle::FixedWing::FlightStage fs);
 #if OSD_ENABLED == ENABLED
     void publish_osd_info();

ArduPlane/navigation.cpp

@@ -95,7 +95,7 @@ void Plane::navigate()
 
     // control mode specific updates to navigation demands
     // ---------------------------------------------------
-    update_navigation();
+    control_mode->navigate();
 }
 
 void Plane::calc_airspeed_errors()