[shape-plan] Remove unused code

src/hb-shape-plan.hh

 /*
- * Copyright © 2012  Google, Inc.
+ * Copyright © 2012,2018  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -71,15 +71,5 @@ struct hb_shape_plan_t
   hb_ot_shape_plan_t ot;
 };
 
-#define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS \
-	, const hb_feature_t *user_features \
-	, unsigned int        num_user_features \
-	, const int          *coords \
-	, unsigned int        num_coords
-#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, shape_plan);
-#include "hb-shaper-list.hh"
-#undef HB_SHAPER_IMPLEMENT
-#undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
-
 
 #endif /* HB_SHAPE_PLAN_HH */