Plane: remove get_advanced_failsafe override; singleton to be used

ArduPlane/GCS_Mavlink.cpp

@@ -1385,15 +1385,6 @@ void GCS_MAVLINK_Plane::handle_mission_set_current(AP_Mission &mission, const ma
     }
 }
 
-AP_AdvancedFailsafe *GCS_MAVLINK_Plane::get_advanced_failsafe() const
-{
-#if ADVANCED_FAILSAFE == ENABLED
-    return &plane.afs;
-#else
-    return nullptr;
-#endif
-}
-
 /*
   set_mode() wrapper for MAVLink SET_MODE
  */

ArduPlane/GCS_Mavlink.h

@@ -16,8 +16,6 @@ protected:
 
     void handle_mission_set_current(AP_Mission &mission, const mavlink_message_t &msg) override;
 
-    AP_AdvancedFailsafe *get_advanced_failsafe() const override;
-
     uint8_t sysid_my_gcs() const override;
     bool sysid_enforce() const override;